5                    1 + 3 + 5 + 7 + 9 = 25

6                    1 + 3 + 5 + 7 + 9 + 11 = 36

7                    1 + 3 + 5 + 7 + 9 + 11 + 13 = 49

8                    1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 = 64

9                    1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 = 81

10                  1 +  3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 = 100

20                   1 +  3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23 +

                        25 + 27 + 29 + 31 + 33 +35 + 37 + 39 = 400