Tam giác Pascal

#include<stdio.h>
#include<conio.h>

int pas(int x, int y)
{
    if (y==1 || y==x) return 1;
    return pas(x-1,y-1)+pas(x-1,y);
}

int main()
{
    int i,j,n;
    printf("Nhap vao so n: "); scanf("%d",&n);

    for (i=1;i<=n+1;i++)
    {
        for (j=1;j<=i;j++)
            printf("%3d ",pas(i,j));
        printf("\n");
    }
    return 0;
}