这样打表为什么没有过?

#include <bits/stdc++.h>
using namespace std;
const int N=25;
int a[N][N]={{1},
			{1,1},
		   {1,2,1},
		  {1,3,3,1},
		 {1,4,6,4,1},
		{1,5,10,10,5,1},
	   {1,6,15,20,15,6,1},
	  {1,7,21,56,70,56,21,7,1},
	 {1,9,36,84,126,126,84,36,9,1},
	{1,10,45,120,210,252,210,120,45,10,1},
   {1,11,55,165,330,462,462,330,165,55,11,1},
  {1,12,66,220,495,792,924,792,495,220,66,12,1},
 {1,13,78,286,715,1287,1716,1716,1287,715,286,78,13,1},
{1,12,91,364,1001,2002,3003,3432,3003,2002,1001,364,91,14,1},
{1,15,105,455,1365,3003,5005,6435,5005,3003,1365,455,105,15},
{1,16,120,560,1820,4368,8008,11440,12870,11440,8008,4368,1280,560,120,16,1},
{1,17,136,680,2380,6188,12376,19448,24310,24310,19448,12376,6188,2380,680,136,17,1},
{1,18,153,816,3060,8568,18564,31824,43758,48620,43758,31824,18564,8568,3060,816,153,18,1},
{1,19,171,969,3876,11628,27132,50388,75582,92378,92378,75582,50388,27132,11628,3876,969,171,19,1},
{1,20,190,1140,4845,15504,38760,77520,125970,167960,187456,167960,125970,77520,38760,15504,4845,1140,190,20,1}};

int main()
{
	int n;
	cin >> n;
	for(int i=0;i<n;i++)
	{
		for(int j=0;j<=20;j++)
		{
			if(a[i][j]==0) continue;
			else
			{
				cout << a[i][j] << ' ';
			}
		}
		cout << endl;
	}
	return 0;
}