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A268779
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Number of nX6 binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two no more than once.
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1
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41, 343, 3354, 27531, 224960, 1755113, 13493468, 101738555, 758303322, 5590121407, 40870469356, 296640792103, 2140108184248, 15358691305417, 109723986174308, 780748875032869, 5535897115345958, 39128843941494495
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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) = 6*a(n-1) +51*a(n-2) -214*a(n-3) -1074*a(n-4) +2018*a(n-5) +7713*a(n-6) -10572*a(n-7) -22926*a(n-8) +30116*a(n-9) +25283*a(n-10) -32400*a(n-11) -15148*a(n-12) +15184*a(n-13) +5660*a(n-14) -2688*a(n-15) -1024*a(n-16)
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EXAMPLE
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Some solutions for n=4
..0..0..0..0..0..0. .0..0..0..1..1..0. .0..0..0..0..0..0. .0..0..0..0..0..0
..0..0..1..0..0..1. .1..0..0..0..0..0. .0..1..0..1..0..1. .0..0..0..1..0..0
..1..0..0..0..0..0. .0..0..0..0..0..0. .0..0..0..0..0..0. .0..0..0..0..0..1
..0..0..1..0..1..0. .1..0..0..0..1..0. .1..0..0..0..1..0. .1..0..1..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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