pyramid.c

#include <stdio.h>

int main()
{
    int line, t, n, k, sum, i, j;

    scanf("%d", &n);

    for(line = 1; line <= n; line++) {
        for(i = 0; i < (n - line); i++)
            printf(" ");
        t = line - 1;
        printf("%d", line);
        for(k = 1; k <= t; k++) {
            sum = line + k;
            printf("%d", sum);
            j = sum;
        }
        for(k =1; k <= t; k++) {
            sum = j - k;
            printf("%d", sum);
        }
        printf("\n");
    }
    return 0;
}