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A303320
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Number of nXn 0..1 arrays with every element equal to 0, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
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0
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1, 2, 4, 2, 64, 56, 2956, 24759, 3531980, 122180446, 68902353881
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