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C programming problem, please read carefully and full answers, thank you.

Write a simple c program, that would calculate the following: 22 +42 +62 + .. . ..+ n2, where n is the nh even number Which is actually the sum of the even numbers. input(n) 1 2 output 4 20 56 560 7 For example when n = 3, the sum is 2, 42-6-56 When n = 7, the sum is 22 +4 2 +62 + 82 + 10-+ 122 + 142 = 560