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A221343
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Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2
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1
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17, 1033, 66077, 4413085, 299240982, 20386200143, 1390606420092, 94886635979289, 6474877285339469, 441834716000600936, 30149910032297404248, 2057359679730562832221, 140388996646009895985892
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