4 x 4 + (4 x 3) = 2828 x 5 + (5 x 4) =160160 x 6 + (6 x 5) = 990990 x 7 + (7 x 6) = 69726972 x 8 + (8 x 7) = 5583255832 x 9 + (9 x 8) = 502560
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