IF the Charlie Brown Group were aging. online puzzle

3x3 - 9 pieces5x5 - 25 pieces8x7 - 56 pieces9x8 - 72 pieces10x9 - 90 pieces11x10 - 110 pieces12x11 - 132 pieces13x12 - 156 pieces15x14 - 210 pieces23x21 - 483 pieces33x30 - 990 pieces Start a new game

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72

9