codewars/go/kyu7/sum_odd_numbers/k.go

package kata

/*
             1                 1 1^3
          3     5              8 2^3
       7     9    11          27 3^3
   13    15    17    19       64 4^3
21    23    25    27    29   125 5^3

First: 1, prev+2, prev+4, prev+6, prev+8...
s(n) = n^3 ?
=> s(n-1) = n^3 -3*n^2+3*n-1
 */

func RowSumOddNumbers(n int) int {
	return n*n*n
}