Please solve online puzzle

7x4 - 28 pieces8x5 - 40 pieces10x6 - 60 pieces12x7 - 84 pieces14x8 - 112 pieces16x9 - 144 pieces17x10 - 170 pieces19x11 - 209 pieces21x12 - 252 pieces23x13 - 299 pieces24x14 - 336 pieces26x15 - 390 pieces28x16 - 448 pieces30x17 - 510 pieces Start a new game Create a multiplayer game table

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144

4