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A295777
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Number of nX4 0..1 arrays with each 1 adjacent to 0 or 2 king-move neighboring 1s.
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1
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8, 49, 198, 1059, 5263, 25529, 127731, 630988, 3118368, 15452696, 76444609, 378316752, 1872559828, 9266918261, 45863407707, 226985095214, 1123365612319, 5559672436516, 27515436853783, 136176807358073, 673954171761877
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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) +6*a(n-2) +6*a(n-3) -58*a(n-4) -20*a(n-5) +29*a(n-6) -92*a(n-7) +7*a(n-8) +2*a(n-9) -2*a(n-10)
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EXAMPLE
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Some solutions for n=7
..0..0..0..0. .0..0..0..1. .0..0..1..1. .0..0..1..0. .0..0..0..1
..0..1..0..0. .0..0..0..0. .1..0..1..0. .1..0..0..0. .1..1..0..0
..1..1..0..0. .1..0..0..0. .0..0..0..0. .0..0..1..0. .0..1..0..1
..0..0..0..0. .0..0..0..1. .0..0..0..1. .0..1..1..0. .0..0..0..0
..0..0..0..1. .0..1..0..0. .0..0..0..0. .0..0..0..0. .0..0..1..0
..1..1..0..0. .0..0..0..0. .1..1..0..1. .0..1..0..0. .0..0..0..0
..1..0..0..0. .1..0..0..0. .0..1..0..0. .1..1..0..1. .1..0..1..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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