I don't know what it is but I'm bored online puzzle

4x2 - 8 pieces9x4 - 36 pieces11x5 - 55 pieces13x6 - 78 pieces15x7 - 105 pieces17x8 - 136 pieces19x9 - 171 pieces21x10 - 210 pieces32x15 - 480 pieces Start a new game

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