Spiral Order Matrix II

1 <= A <= 1000

First and only argument is integer A

Return a 2-D matrix which consists of the elements added in spiral order.

Input 1:
1

Input 2:
2

Output 1:
[ [1] ]

Output 2:
[ [1, 2], 
  [4, 3] ]

Explanation 1:
Only 1 is to be arranged.

Explanation 2:
1 --> 2
      |
      |
4<--- 3