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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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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..2..2..0..0..2....0..2..0..2..0..2....2..0..2..0..2..0....0..2..0..2..0..0
..0..0..2..2..0..0....2..0..0..2..0..2....2..2..0..2..0..2....0..2..2..2..2..0
..0..2..2..2..2..0....2..0..0..2..0..2....0..0..2..0..2..0....2..0..2..0..0..2
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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