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A304598
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Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 5 or 6 king-move adjacent elements, with upper left element zero.
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0
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1, 4, 13, 73, 560, 6007, 75463, 1874284, 62934491, 2085910493, 94776909801, 7409071360844, 887762245576310
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