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A185407
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1/7 the number of nX4 0..6 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors
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1
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7, 1848, 279918, 53808534, 9560464068, 1755419411964, 318289797234978, 58009184105051760, 10550717546713596858, 1920558372882730002666, 349484670721711744198032, 63604421284059206327321532
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