P17267 [GeeksforGeeks] Power of pow even number5440
普及-
题目描述

Given a single integer N, your task is to find the sum of the square of the first N even natural Numbers.

Example 1:
Input: 2
Output: 20
Explanation: 2^{2 + }4^{2 }= 20
Example 2:
Input: 3
Outptut: 56
Explanation: 2^{2} + 4^{2} + 6^{2} = 56

Your Task:
You don't need to read or print anything. Your task is to complete the function sum_of_square_evenNumbers() which takes N as the input parameter and returns the sum of the first N even natural numbers.

Expected Time Complexity: O(1)
Expected Space Complexity: O(1)

Constraints:
1 <= N <= 10000

输入格式

见题面

输出格式

见题面

样例输入
2
样例输出
20