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A193481
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Number of n X n symmetric 0..2 arrays with each element equal to the product mod 3 of two of its horizontal and vertical neighbors
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0
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0, 2, 8, 127, 3686, 285929, 47398400, 18127384939, 15993244772677, 32531416116323498, 152344987111028997103, 1640044640940871976733780
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