#include<iostream>
using namespace std;
int N,id,k,A[300][300];
main(){
	cin>>N;
	for(int i=0;i<N/2;i++)for(int j=0;j<N;j++)k=i%2?N+~j:j,A[i][k]=++id,A[i+N/2][(k+N/2)%N]=++id;
	for(int i=0;i<N;i++)for(int j=0;j<N;j++)cout<<A[i][j]<<(j==N-1?"\n":" ");
}