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A298959
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Number of nX4 0..1 arrays with every element equal to 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
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1
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0, 2, 2, 7, 14, 34, 75, 174, 396, 907, 2070, 4734, 10819, 24730, 56520, 129187, 295274, 674890, 1542547, 3525702, 8058468, 18418715, 42098446, 96221670, 219927587, 502674114, 1148929360, 2626032755, 6002151458, 13718725330, 31355993907
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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) = 2*a(n-1) +a(n-3) +2*a(n-4) -2*a(n-5)
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EXAMPLE
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Some solutions for n=5
..0..0..0..0. .0..0..0..0. .0..0..1..1. .0..0..0..0. .0..0..1..1
..0..0..0..0. .0..0..0..0. .0..0..1..1. .0..0..0..0. .0..0..1..1
..1..1..1..1. .0..0..0..0. .0..0..1..1. .1..1..0..0. .0..0..1..1
..1..1..1..1. .1..1..1..1. .1..1..1..1. .1..1..0..0. .0..0..1..1
..1..1..1..1. .1..1..1..1. .1..1..1..1. .1..1..0..0. .0..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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