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A300374
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Number of nX2 0..1 arrays with every element equal to 0, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
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4
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1, 3, 2, 10, 13, 42, 74, 188, 387, 885, 1937, 4275, 9526, 20871, 46566, 102205, 227355, 500590, 1110398, 2450549, 5426150, 11990298, 26526428, 58649475, 129706253, 286835657, 634286359, 1402736818, 3101877239, 6859804246, 15169348965
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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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FORMULA
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Empirical: a(n) = 4*a(n-2) +2*a(n-3) +a(n-5) -3*a(n-6) +a(n-7)
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EXAMPLE
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Some solutions for n=5
..0..1. .0..1. .0..0. .0..0. .0..0. .0..0. .0..1. .0..1. .0..0. .0..0
..1..1. .1..1. .0..1. .0..1. .0..1. .0..0. .1..1. .1..1. .0..1. .0..1
..1..0. .0..1. .1..1. .1..1. .1..1. .1..0. .1..0. .0..0. .1..1. .0..0
..0..0. .1..1. .0..0. .0..0. .1..0. .0..0. .1..1. .0..1. .0..1. .1..0
..0..1. .1..0. .0..0. .0..1. .0..0. .0..1. .1..0. .1..1. .1..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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