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A268883
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Number of nX5 binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.
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1
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10, 158, 2190, 27130, 317966, 3596174, 39670270, 429588382, 4585939726, 48401059362, 506108414670, 5251396681678, 54134020936742, 554930619106590, 5661171443312270, 57509255942550986, 582036972222995470
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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) = 26*a(n-1) -241*a(n-2) +994*a(n-3) -2060*a(n-4) +2218*a(n-5) -1201*a(n-6) +290*a(n-7) -25*a(n-8) for n>9
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EXAMPLE
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Some solutions for n=4
..1..0..0..0..0. .1..0..0..0..1. .0..0..1..0..0. .0..1..0..1..0
..1..0..0..1..0. .0..0..0..1..0. .1..0..0..1..0. .0..1..0..0..0
..1..1..0..0..0. .0..1..0..0..0. .1..0..1..0..1. .0..0..0..1..0
..0..0..1..0..1. .0..0..1..0..0. .1..0..0..0..1. .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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