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A300640
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Number of n X n 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
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0
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0, 1, 2, 64, 2998, 456649, 209156119, 280782187131, 1114340919987573, 12994612967873847001, 446094799302794492462850
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