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A268763
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Number of nX5 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once.
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1
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10, 105, 762, 5170, 32056, 193573, 1129042, 6475898, 36505596, 203462597, 1122256900, 6140903312, 33367393732, 180252797855, 968778729426, 5183858768244, 27630592631158, 146768594783741, 777214421588348
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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) +28*a(n-2) -62*a(n-3) -314*a(n-4) +78*a(n-5) +867*a(n-6) +6*a(n-7) -859*a(n-8) +46*a(n-9) +215*a(n-10) -8*a(n-11) -16*a(n-12)
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EXAMPLE
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Some solutions for n=4
..1..0..1..0..0. .1..0..0..0..1. .1..0..0..0..0. .0..0..0..0..0
..0..0..0..0..0. .0..0..1..0..1. .0..0..1..0..1. .0..0..0..0..0
..1..0..0..0..0. .0..0..0..0..0. .0..1..0..0..0. .0..1..0..1..0
..0..1..0..0..1. .1..0..0..0..1. .0..0..0..1..0. .1..0..0..0..0
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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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