C :

#include<stdio.h>
int a[100][100];
int main(){
    int n,i,j;
    scanf("%d",&n);
    for(j=1;j<=n;j++){
        for(i=n;i>=1;i--){
            if(i==j){
                a[i][j] = i;
            }else{
                a[i][j] = a[i+1][j] + a[i][j-1];
            }
        }
    }
    for(i=1;i<=n;i++){
        for(j=1;j<=n;j++){
            if(i>j){
                printf("%5s","");
            }else{
                printf("%5d",a[i][j]);
            }
        }
        printf("\n");
    }
    return 0;
}

C++ :

#include <bits/stdc++.h>
using namespace std;

int main(){
	int a[20][20] = {0};
	int i,j,n;
	cin>>n;
	
	for (i = 0;i < n;i++){
		a[i][i] = i + 1;
	}
	
	for (i = 0;i < n - 1;i++){
		for (j = 0;j < n - i - 1;j++){
			a[j][j + i + 1] = a[j][j + i] + a[j + 1][j + i + 1];
		}
	}
	
	for (i = 0;i < n;i++){
		for (j = 0;j < n;j++){
			if (a[i][j] == 0){
				cout<<setw(5)<<" ";
			}else{
				cout<<setw(5)<<a[i][j];
			}
		}
		cout<<endl;
	}
}

Python :

n = int(input())
a = [[0 for j in range(n)] for i in range(n)]

# 先赋值左对角线
for i in range(n):
    a[i][i] = i + 1
# 以列为大方向,从1~n列
for j in range(1, n):
    # 以行为小方向,从j-1~0
    for i in range(j - 1, -1, -1):
        a[i][j] = a[i + 1][j] + a[i][j - 1]

for i in range(n):
    for j in range(n):
        if a[i][j] == 0:
            print('%5s' % ' ', end='')
        else:
            print('%5d' % (a[i][j]), end='')
    print()