n = int(input()) s = [] for x in range(n): s.append([0]*n) tws = ((1,0),(0,-1),(-1,0),(0,1)) x,y = 0 ,n-1 i = 1 s[x][y] = i while i < n**2: for d in tws: x, y = x + d[0], y + d[1] while 0 <= x < n and 0 <= y < n and s[x][y] == 0: i += 1 s[x][y] = i x, y = x + d[0], y + d[1] x,y = x-d[0],y-d[1] for row in s: print(*row)