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A221347
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Number of 4Xn 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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0
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1, 1001, 60807, 4413085, 308965149, 22068912649, 1581061669545, 113618510899217, 8171887820833287, 587983789007292695, 42310129466893396913, 3044554852614334562897
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