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A220999
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Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor
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1
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21, 2989, 394580, 51672851, 6758547145, 883809591160, 115571009291599, 15112491898694315, 1976162121051496204, 258409744432367037405, 33790541796768618273627, 4418566652828051992947794
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