N=int(input())
ans_lst=[[None]*N for i in range(N)]
cur=0
for i in range(N):
    if i%2==0:
        ans_lst[i][i]=cur
        cur+=1
        for j in range(i+1,N):
            if j%2:
                ans_lst[i][j]=cur
                cur+=1
                ans_lst[j][i]=cur
                cur+=1
            else:
                ans_lst[j][i]=cur
                cur+=1
                ans_lst[i][j]=cur
                cur+=1
    else:
        for j in range(N-1,i,-1):
            if j%2==0:
                ans_lst[i][j]=cur
                cur+=1
                ans_lst[j][i]=cur
                cur+=1
            else:
                ans_lst[j][i]=cur
                cur+=1
                ans_lst[i][j]=cur
                cur+=1
        ans_lst[i][i]=cur
        cur+=1
for i in range(N):
    print(*[ans+1 for ans in ans_lst[i]])