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A221696
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Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction
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1
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1, 987, 63676, 7033429, 659020617, 64509677154, 6233675847228, 604346923784252, 58538232535028520, 5671250113728678882, 549411330594167686392, 53225495837252796349285, 5156336905625087231654148
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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
..2..0..0....2..0..1....0..1..1....1..0..0....0..4..1....1..0..0....0..3..2
..0..3..1....1..1..0....2..3..0....1..4..0....0..0..1....2..2..1....0..0..1
..1..0..1....2..0..0....0..0..0....2..0..2....2..1..0....0..2..0....1..2..1
..1..3..0....1..3..1....2..1..2....0..1..1....0..3..0....1..3..0....1..0..1
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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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