def rot_right(a):
    return zip(*a[::-1])

def sp(m, n, start = 0):
    """ Generate number range spiral of dimensions m x n
    """
    if n == 0:
        yield ()
    else:
        yield tuple(range(start, m + start))
        for row in rot_right(list(sp(n - 1, m, m + start))):
            yield row

def spiral(m):
    return sp(m, m)

for row in spiral(5):
    print(''.join('%3i' % i for i in row))