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A211907
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Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal or vertical neighbor, and containing the value n(n+1)/2-4
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0
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0, 0, 41, 2385, 55822, 637721, 4639742, 24871596, 106911695, 388681117, 1238600816, 3548005682, 9306274551
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