n = int(input())
t = [[0] * n for _ in range(n)]
i = j = 0
dij = [[0, 1], [1, 0], [0, -1], [-1, 0]]
di, dj = dij[0]
d = 0
flag = 1
hen = n
cnt = hen
for k in range(1, n**2, 2):
    t[i][j] = k
    t[n-i-1][n-j-1]=k+1
    cnt -= 1
    if cnt == 0:
        if flag:
            flag = 0
            hen -= 2
        else:
            flag = 1
        cnt = hen
        d = (d + 1) % 4
        di, dj = dij[d]
    i, j = i + di, j + dj
for x in t:
    print(*x)