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A286973
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Number of n X 2 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 two less than the number of 0's adjacent to some 1.
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2
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0, 0, 5, 30, 126, 520, 2088, 8192, 32083, 125728, 492331, 1927334, 7545086, 29542032, 115713230, 453479812, 1778221568, 6976989468, 27390464896, 107590106636, 422842742731, 1662688326476, 6541232413273, 25746371202362, 101384373381977
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OFFSET
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1,3
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..0. .0..1. .1..0. .0..1. .0..0. .0..0. .1..0. .0..0. .0..0. .0..1
..1..0. .0..0. .0..0. .0..1. .1..1. .0..1. .1..0. .0..1. .1..0. .0..0
..1..0. .0..0. .0..1. .0..0. .0..0. .0..1. .0..0. .0..0. .0..1. .1..1
..0..0. .1..0. .1..0. .1..0. .0..0. .0..0. .0..1. .0..1. .0..0. .0..0
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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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