表达式公式的一个计算的问题，如何利用C语言的程序的设计的方式来实现表达式的？

Problem Description
You just need to calculate the sum of the formula: 1^2+3^2+5^2+……+ n ^2.

Input
In each case, there is an odd positive integer n.

Output
Print the sum. Make sure the sum will not exceed 2^31-1

Sample Input
3

Sample Output
10