C++ :

#include<bits/stdc++.h>
using namespace std;
int main(){
	int i,j,n,a[10][10]={0};
	cin>>n;
	for(i=0;i<n;i++){
		for(j=0;j<n-i;j++){
			if(i==0){
				a[j][j+i]=j+1;
			}else{
				a[j][j+i]=a[j][j+i-1]+a[j+1][j+i];
				a[j+i][j]=a[j+i-1][j]+a[j+i][j+1];
			}
		}
	}
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			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1~4
for i in range(n):
    a[i][i] = i + 1
# 赋值左对角线下面的部分,以"列"为大方向从n-2~0,逆方向,"行"为小方向依次赋值j+1~n-1,正方向
for j in range(n - 2, -1, -1):
    for i in range(j+1, n):
        a[i][j] = a[i][j + 1] + a[i - 1][j]
#赋值做对角线上面的部分,以"列"为大方向从1~n-1,正方向,"行"为小方向依次赋值j-1~0,逆方向
for j in range(1, n):
    for i in range(j-1, -1,-1):
        a[i][j] = a[i][j - 1] + a[i+1][j]
#打印输出
for i in range(n):
    for j in range(n):
        print('%5d' % a[i][j], end='')
    print()