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A221417
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Number of nX6 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two
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1
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8, 242, 6798, 193809, 5501288, 156275181, 4438212854, 126047555332, 3579725111162, 101663058496174, 2887188399895922, 81994856978729880, 2328615956549861402, 66131601824729724429, 1878106344412444059646
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