输入一个奇数，返回奇数矩阵。矩阵中数字有1到n。使矩阵每行，每列以及对角线上所有数之和相等。-If you input an odd number, you will get a matrix which consist of n*n numer from 1 to n^2,and the sum of every line,every column and numbers on the diagonals are equal.