跪求高手指點迷津 数字排列问题!!!

我有一個数字排列的问题困扰很久 题目如下:

输入一个数i i=3,5,7….  当输入为3时 输出为: 7 8 9
                                                             6 1 2
                                                             5 4 3

                                当输入为5时 输出为:  21 22 23 24 25
                                                              20  7   8   9 10
                                                              19  6   1   2 11
                                                              18  5   4   3 12
                                                              17 16 15 14 13   

输出个数为输入数值的平方 由1为中心向外排列.

各位大侠给我指条生路啊!