Formula for non-metallic rust online puzzle

4x2 - 8 pieces7x4 - 28 pieces9x5 - 45 pieces11x6 - 66 pieces12x7 - 84 pieces14x8 - 112 pieces16x9 - 144 pieces20x11 - 220 pieces30x17 - 510 pieces43x24 - 1032 pieces Start a new game

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