nice.c

#include <stdio.h>
int main()
{
    int n;
    printf("Enter a n: ");
    scanf("%d", &n);
    for (int i = n; i >= 1; i--)
    {
        for (int j = n; j > i; j--)
        {
            printf("%d ", j);
        }
        for (int j = 1; j <= i * 2 - 1; j++)
        {
            printf("%d ", i);
        }
        for (int j = i + 1; j <= n; j++)
        {
            printf("%d ", j);
        }

        printf("\n");
    }
    for (int i = 1; i < n; i++)
    {
        for (int j = n; j > i; j--)
        {
            printf("%d ", j);
        }
        for (int j = 1; j <= 2 * i - 1; j++)
        {
            printf("%d ", i + 1);
        }
        for (int j = i + 1; j <= n; j++)
        {
            printf("%d ", j);
        }

        printf("\n");
    }

    return 0;
}