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A208107
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Number of nX7 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically
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1
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40, 1600, 6016, 25555, 134160, 768544, 4747545, 30461016, 200679160, 1341923275, 9060096280, 61521142072, 419255546841, 2863417898992, 19583147331312, 134042927712195, 917974509748384, 6288633342628816, 43089144637765369
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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) = 11*a(n-1) -17*a(n-2) -124*a(n-3) +276*a(n-4) +396*a(n-5) -902*a(n-6) -462*a(n-7) +946*a(n-8) +220*a(n-9) -340*a(n-10) -44*a(n-11) +39*a(n-12) +3*a(n-13) -a(n-14) for n>15
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EXAMPLE
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Some solutions for n=4
..0..1..1..0..1..1..1....1..1..0..1..1..0..1....1..1..1..0..1..1..0
..0..1..1..1..0..1..1....0..0..1..1..0..1..1....0..1..1..0..0..1..1
..0..1..1..0..1..1..1....1..0..0..1..1..0..1....0..1..1..1..1..1..0
..0..1..1..1..0..1..1....0..0..1..1..0..0..1....1..1..1..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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