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A221931
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Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns
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1
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1, 184, 5748, 201378, 6888458, 236114556, 8089630790, 277061308667, 9488649958342, 324954778576668, 11128548401493743, 381112186997579115, 13051688407062314783, 446972092491243621991, 15307140370408977681367
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OFFSET
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1,2
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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..0..0....1..2..0....1..2..0....0..0..0....0..5..0....1..0..0....1..3..1
..2..4..1....2..1..2....0..1..2....1..4..2....1..2..0....2..2..0....0..0..0
..2..0..0....0..0..1....1..0..2....1..1..0....1..0..0....0..4..0....2..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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