This is America online puzzle

5x4 - 20 pieces7x5 - 35 pieces8x6 - 48 pieces10x7 - 70 pieces11x8 - 88 pieces12x9 - 108 pieces14x10 - 140 pieces15x11 - 165 pieces17x12 - 204 pieces18x13 - 234 pieces20x14 - 280 pieces21x15 - 315 pieces23x16 - 368 pieces24x17 - 408 pieces25x18 - 450 pieces27x19 - 513 pieces28x20 - 560 pieces30x21 - 630 pieces Start a new game Create a multiplayer game table

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20

4