Используя рекурсивную функцию, напечатать следующую таблицу

#include<iostream>
#include<cmath>
using namespace std;
 
void print(int n, char a) { //печать n символов a
    for (int i = 0; i < n; i++)
        cout << a;
    
}
 
void F(int p, int n, char a) { // p - пробелов, n - символов
     if (n > 0) {
         print(p, ' '); //печать пробелов
         print(n, a); //печать цифр
         cout << endl; //переход на следующую строку
         F(p + 1, n - 2, a + 1); //вызов функции для следующей строки
         print(p, ' '); //нижняя часть
         print(n, a);
         cout << endl;
        
    }
    
}
 
 int main() {
     int N;
     do {
         cout << " Input N < 18 \n"; //ввод данных
         cin >> N;
        
    }
     while (N > 18);
     if (N % 2 == 0) N --;
     F(1, N, '1'); //вызов функции
     system("pause");
     return 0;
    
}

const int l = 2*('Z'-'A');
 
void s(char c, int i, int n) {
    if (n==0) {cout<<c; return;}
    char p = n>=i && n<=(l-i) ? '-' : c;
    cout<<p; s(c,i,n-1); cout<<p;
}
 
void t(char c, int n) {
    if (c>'Z') return;
    s(c,n,l); cout<<'\n'; t(c+1,n+1); s(c,n,l); cout<<'\n';
}
 
int main() {t('A',1);}

A-------------------------------------------------A-------------------------------------------------A
BB-----------------------------------------------BBB-----------------------------------------------BB
CCC---------------------------------------------CCCCC---------------------------------------------CCC
DDDD-------------------------------------------DDDDDDD-------------------------------------------DDDD
EEEEE-----------------------------------------EEEEEEEEE-----------------------------------------EEEEE
FFFFFF---------------------------------------FFFFFFFFFFF---------------------------------------FFFFFF
GGGGGGG-------------------------------------GGGGGGGGGGGGG-------------------------------------GGGGGGG
HHHHHHHH-----------------------------------HHHHHHHHHHHHHHH-----------------------------------HHHHHHHH
IIIIIIIII---------------------------------IIIIIIIIIIIIIIIII---------------------------------IIIIIIIII
JJJJJJJJJJ-------------------------------JJJJJJJJJJJJJJJJJJJ-------------------------------JJJJJJJJJJ
KKKKKKKKKKK-----------------------------KKKKKKKKKKKKKKKKKKKKK-----------------------------KKKKKKKKKKK
LLLLLLLLLLLL---------------------------LLLLLLLLLLLLLLLLLLLLLLL---------------------------LLLLLLLLLLLL
MMMMMMMMMMMMM-------------------------MMMMMMMMMMMMMMMMMMMMMMMMM-------------------------MMMMMMMMMMMMM
NNNNNNNNNNNNNN-----------------------NNNNNNNNNNNNNNNNNNNNNNNNNNN-----------------------NNNNNNNNNNNNNN
OOOOOOOOOOOOOOO---------------------OOOOOOOOOOOOOOOOOOOOOOOOOOOOO---------------------OOOOOOOOOOOOOOO
PPPPPPPPPPPPPPPP-------------------PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP-------------------PPPPPPPPPPPPPPPP
QQQQQQQQQQQQQQQQQ-----------------QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ-----------------QQQQQQQQQQQQQQQQQ
RRRRRRRRRRRRRRRRRR---------------RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR---------------RRRRRRRRRRRRRRRRRR
SSSSSSSSSSSSSSSSSSS-------------SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS-------------SSSSSSSSSSSSSSSSSSS
TTTTTTTTTTTTTTTTTTTT-----------TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT-----------TTTTTTTTTTTTTTTTTTTT
UUUUUUUUUUUUUUUUUUUUU---------UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU---------UUUUUUUUUUUUUUUUUUUUU
VVVVVVVVVVVVVVVVVVVVVV-------VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV-------VVVVVVVVVVVVVVVVVVVVVV
WWWWWWWWWWWWWWWWWWWWWWW-----WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW-----WWWWWWWWWWWWWWWWWWWWWWW
XXXXXXXXXXXXXXXXXXXXXXXX---XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX---XXXXXXXXXXXXXXXXXXXXXXXX
YYYYYYYYYYYYYYYYYYYYYYYYY-YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY-YYYYYYYYYYYYYYYYYYYYYYYYY
ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
YYYYYYYYYYYYYYYYYYYYYYYYY-YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY-YYYYYYYYYYYYYYYYYYYYYYYYY
XXXXXXXXXXXXXXXXXXXXXXXX---XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX---XXXXXXXXXXXXXXXXXXXXXXXX
WWWWWWWWWWWWWWWWWWWWWWW-----WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW-----WWWWWWWWWWWWWWWWWWWWWWW
VVVVVVVVVVVVVVVVVVVVVV-------VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV-------VVVVVVVVVVVVVVVVVVVVVV
UUUUUUUUUUUUUUUUUUUUU---------UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU---------UUUUUUUUUUUUUUUUUUUUU
TTTTTTTTTTTTTTTTTTTT-----------TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT-----------TTTTTTTTTTTTTTTTTTTT
SSSSSSSSSSSSSSSSSSS-------------SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS-------------SSSSSSSSSSSSSSSSSSS
RRRRRRRRRRRRRRRRRR---------------RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR---------------RRRRRRRRRRRRRRRRRR
QQQQQQQQQQQQQQQQQ-----------------QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ-----------------QQQQQQQQQQQQQQQQQ
PPPPPPPPPPPPPPPP-------------------PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP-------------------PPPPPPPPPPPPPPPP
OOOOOOOOOOOOOOO---------------------OOOOOOOOOOOOOOOOOOOOOOOOOOOOO---------------------OOOOOOOOOOOOOOO
NNNNNNNNNNNNNN-----------------------NNNNNNNNNNNNNNNNNNNNNNNNNNN-----------------------NNNNNNNNNNNNNN
MMMMMMMMMMMMM-------------------------MMMMMMMMMMMMMMMMMMMMMMMMM-------------------------MMMMMMMMMMMMM
LLLLLLLLLLLL---------------------------LLLLLLLLLLLLLLLLLLLLLLL---------------------------LLLLLLLLLLLL
KKKKKKKKKKK-----------------------------KKKKKKKKKKKKKKKKKKKKK-----------------------------KKKKKKKKKKK
JJJJJJJJJJ-------------------------------JJJJJJJJJJJJJJJJJJJ-------------------------------JJJJJJJJJJ
IIIIIIIII---------------------------------IIIIIIIIIIIIIIIII---------------------------------IIIIIIIII
HHHHHHHH-----------------------------------HHHHHHHHHHHHHHH-----------------------------------HHHHHHHH
GGGGGGG-------------------------------------GGGGGGGGGGGGG-------------------------------------GGGGGGG
FFFFFF---------------------------------------FFFFFFFFFFF---------------------------------------FFFFFF
EEEEE-----------------------------------------EEEEEEEEE-----------------------------------------EEEEE
DDDD-------------------------------------------DDDDDDD-------------------------------------------DDDD
CCC---------------------------------------------CCCCC---------------------------------------------CCC
BB-----------------------------------------------BBB-----------------------------------------------BB
A-------------------------------------------------A-------------------------------------------------A

#include <iostream>
 
void foo(const char c = 'A', const int step = 1)
{
    for (int i='A'; i <= 'A'+4*('Z'-'A'); i++)
        std::cout << ((i > c && i < 2*'Z'-c) || (i > 2*('Z'-'A')+c && i < 4*'Z'-2*'A'-c) ? '-' : c);
    std::cout << std::endl;
 
    if (c == 'Z')
        foo(c-1, -1);
    else if (c != 'A' || step != -1)
        foo(c + step, step);
}
 
int main()
{
    foo();
}