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A304341
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Number of nX2 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.
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8
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2, 4, 14, 28, 94, 284, 752, 2244, 6532, 18472, 53680, 155040, 445000, 1285184, 3706032, 10672592, 30778032, 88725600, 255701024, 737147264, 2124889120, 6124798656, 17655444096, 50892739392, 146699089600, 422869223040
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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) = 2*a(n-1) +2*a(n-2) +6*a(n-3) -10*a(n-4) -8*a(n-5) for n>6
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EXAMPLE
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Some solutions for n=5
..0..0. .0..0. .0..1. .0..0. .0..0. .0..1. .0..0. .0..1. .0..1. .0..0
..1..1. .0..1. .1..0. .0..0. .0..0. .1..0. .0..1. .0..1. .1..0. .0..1
..1..1. .1..0. .1..1. .0..1. .1..0. .1..1. .0..1. .0..0. .1..1. .0..0
..1..0. .1..1. .1..1. .0..0. .0..1. .1..0. .1..1. .0..1. .1..0. .0..0
..1..0. .1..1. .0..0. .0..0. .0..0. .0..1. .1..1. .0..0. .1..0. .1..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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