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A301612
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Number of nX5 0..1 arrays with every element equal to 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.
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1
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3, 111, 2131, 40085, 758338, 14345706, 271301458, 5131197358, 97045266159, 1835413254015, 34712996298775, 656524254453280, 12416789603607923, 234837748693978527, 4441467446525879000, 84001117092821240904
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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 recurrence of order 68 (see link above)
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EXAMPLE
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Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0
..1..1..1..0..0. .0..0..1..0..1. .1..0..1..1..0. .1..1..1..1..0
..1..1..1..1..0. .1..0..1..0..1. .1..1..1..0..1. .1..1..0..0..0
..0..0..0..1..1. .1..0..1..1..1. .1..1..0..0..1. .0..1..1..0..0
..1..1..1..1..1. .1..0..1..1..1. .1..1..0..0..1. .0..1..1..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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