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A221823
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Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without consecutive moves in the same direction
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1
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13, 2113, 190756, 18636989, 1804472268, 174820457922, 16936005698353, 1640717334488903, 158947987755078035, 15398437448141904936, 1491757378064714004413, 144517269678468770214198
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