n = int(input())
d = [[0] * n for _ in range(n)]
from itertools import chain

for i, s in enumerate(chain(range(1, n + 1, 2), range(2, n + 1, 2))):
    for j, x in enumerate(range(s, s - n, -1)):
        d[j][i] = (x - 1) % n + 1
for r in d:
    print(*r)