include <stdio.h>

define N 23

void main(){
int i,j,k;
int a[N][N];
for(i=0;i<N;i++){
a[i][0]=1;
a[i][i]=1;
}
for(i=2;i<N;i++){
for (j=1;j<i;j++){
a[i][j]=a[i-1][j-1]+a[i-1][j];
}
}
for(i=0;i<N;i++){
for(int m=N-i;m>0;m--){
printf (" ");
}
for(j=0;j<=i;j++){
printf("%4d ",a[i][j]);
}
printf ("\n");
}
}