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A301908
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Number of 4Xn 0..1 arrays with every element equal to 0, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
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1
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8, 1, 7, 5, 8, 40, 96, 316, 1078, 3831, 13331, 46127, 161362, 564617, 1975369, 6914911, 24216868, 84826850, 297130258, 1040826424, 3646117344, 12772898193, 44745724111, 156753135377, 549139791596, 1923758528089, 6739359943131
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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=5
..0..1..1..0..0. .0..1..1..0..0. .0..1..1..0..0. .0..1..1..0..0
..1..1..0..0..1. .1..1..0..0..0. .1..1..0..0..0. .1..1..0..0..1
..1..1..1..0..0. .0..1..1..0..0. .1..1..1..0..0. .0..1..1..0..0
..1..1..0..0..1. .1..1..0..0..1. .1..1..0..0..1. .1..1..0..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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