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A298049
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Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero.
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0
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0, 3, 15, 40, 121, 512, 1708, 7014, 35804, 201703, 1158266, 7391098, 54852360
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