Write a program that asks the user to enter an integer number n, and computes the following mathematical series: ?

Your program should use a "for" loop to compute this series. Your program should run as follows (items in italics are to be entered by the user): Enter an integer number: 5 The value of the series is: 15

I have the start of the program (printf to get the value, scanf to identify it) I'm just having a hard time using the for loop for the series.

S 12 22 32 42 (-1) n+1 n2