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A298215
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Number of nX2 0..1 arrays with every element equal 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, 7, 13, 29, 73, 157, 353, 869, 1993, 4557, 10993, 25909, 60313, 144157, 343233, 809349, 1929833, 4610157, 10953873, 26130389, 62487353, 149069757, 356015713, 851720229, 2035889673, 4867238157, 11647445553, 27867454069, 66671141593
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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) = 4*a(n-1) -5*a(n-2) +10*a(n-3) -24*a(n-4) +16*a(n-5) for n>6
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EXAMPLE
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Some solutions for n=7
..0..1. .0..1. .0..1. .0..1. .0..0. .0..0. .0..0. .0..1. .0..0. .0..0
..0..0. .0..0. .0..0. .1..0. .0..1. .0..1. .1..1. .1..1. .1..0. .1..1
..0..0. .0..0. .0..0. .1..0. .0..0. .1..1. .0..0. .0..0. .1..1. .0..1
..1..0. .1..0. .0..1. .1..0. .0..0. .1..1. .1..0. .0..1. .1..1. .0..0
..0..0. .1..1. .1..1. .0..1. .0..0. .1..1. .1..1. .0..0. .1..0. .1..1
..1..1. .1..1. .0..0. .1..0. .0..1. .1..0. .0..0. .1..1. .1..1. .0..1
..0..1. .0..1. .0..1. .0..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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