#include <stdio.h>

long factorial(int);

long factorial(int two){
    int three;
    long result = 1;
    for (three =1; three <= two; three++)
        result = result*three;
    return result;
}



int main(int argc, char **argv){
    int one;
    int two;
    int three;
    printf("Please enter the number of rows you wish to see in the pascal triangle\n");
    scanf("%d",&two);

    if (two > 20 || two < 1){
        printf("The value entered must be between 1 and 20 exclusively.");
        return 1;
    }
    for (one = 0; one < two; one++)
    {
        for (three = 0; three <= (two - one - 2); three++)
        printf(" ");
        for (three = 0; three <= one; three++)
        printf("%ld", factorial(one)/(factorial(three)*factorial(one-three)));

        printf("\n");


    }

    return 0;
}