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A316810
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Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
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1
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4, 32, 227, 1603, 11339, 80196, 567185, 4011528, 28372197, 200667334, 1419255442, 10037936386, 70995092862, 502125441515, 3551371640686, 25117708652986, 177649469535317, 1256457524264038, 8886519697845327, 62851493835499033
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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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FORMULA
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Empirical: a(n) = 6*a(n-1) +10*a(n-2) -7*a(n-3) -64*a(n-4) -51*a(n-5) for n>6
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EXAMPLE
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Some solutions for n=5
..0..1..1. .0..0..0. .0..0..0. .0..1..1. .0..0..1. .0..0..0. .0..0..1
..0..0..1. .1..1..0. .0..0..1. .0..0..1. .0..0..0. .1..0..0. .0..0..0
..1..0..0. .0..1..1. .1..1..1. .1..0..1. .0..0..0. .0..1..0. .0..1..1
..0..1..0. .0..0..0. .1..1..1. .0..1..0. .0..0..1. .1..0..1. .1..1..0
..0..0..0. .1..1..0. .0..0..1. .1..1..0. .1..1..0. .0..0..0. .1..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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