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A221722
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Number of n X 4 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor.
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1
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21, 3605, 544757, 81980587, 12325049264, 1852447247829, 278394265759168, 41836968289680535, 6287169859547251975, 944818763789937611918, 141984605326159531366196, 21337022505681038084244109
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