n = int(input())
d = [[0] * n for _ in range(n)]

nxt = 1
for i in range(n):
    if i % 2 == 0:
        d[i][i] = nxt
        nxt += 1
        for j in range(i)[::-1]:
            if j % 2 == 0:
                d[j][i] = nxt
                nxt += 1
                d[i][j] = nxt
                nxt += 1
            else:
                d[i][j] = nxt
                nxt += 1
                d[j][i] = nxt
                nxt += 1
    else:
        for j in range(i):
            if j % 2 == 1:
                d[j][i] = nxt
                nxt += 1
                d[i][j] = nxt
                nxt += 1
            else:
                d[i][j] = nxt
                nxt += 1
                d[j][i] = nxt
                nxt += 1
        d[i][i] = nxt
        nxt += 1
for di in d:
    print(*di)