20 * 20 = 400
18 * 18 = 324
16 * 16 = 256
14 * 14 = 196
12 * 12 = 144
10 * 10 = 100
8 * 8 = 64
6 * 6 = 36
4 * 4 = 16
2 * 2 = 4
0 * 0 = 0