The sum of the first n positive perfect squares, where n is

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The sum of the first n positive perfect squares, where n is a positive integer, is given by the formula n^3/3 + c*n^2 + n/6, where c is a constant. What is the sum of the first 15 positive perfect squares?

A. 1,010
B. 1,164
C. 1,240
D. 1,316
E. 1,476

The OA is C

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