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A298577
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Number of nX3 0..1 arrays with every element equal to 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
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1
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1, 7, 15, 25, 47, 113, 261, 601, 1397, 3223, 7501, 17523, 40935, 95683, 223799, 523857, 1226779, 2873985, 6734933, 15786173, 37008905, 86776771, 203494869, 477250155, 1119367539, 2625588427, 6158890175, 14447602189, 33892459607, 79509969725
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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) = 3*a(n-1) -a(n-3) -7*a(n-4) +2*a(n-5) -2*a(n-6) +4*a(n-7) -3*a(n-8) +13*a(n-9) +8*a(n-10) -5*a(n-11) -15*a(n-12) +4*a(n-14) for n>15
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EXAMPLE
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Some solutions for n=5
..0..0..1. .0..0..1. .0..1..1. .0..1..0. .0..0..1. .0..1..0. .0..1..0
..1..1..0. .0..1..1. .0..0..1. .1..0..1. .0..1..1. .1..0..0. .1..0..0
..1..0..1. .0..0..0. .0..0..0. .0..1..0. .0..0..0. .1..0..0. .0..1..1
..1..1..0. .1..1..0. .0..1..1. .1..0..1. .0..0..1. .1..0..1. .1..1..0
..0..0..1. .1..0..0. .0..0..1. .0..1..0. .0..1..1. .0..1..0. .0..0..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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