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A299663
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Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
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2
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4, 31, 179, 1080, 6585, 40023, 243312, 1479656, 8997567, 54712960, 332705597, 2023155240, 12302638210, 74811344202, 454921691740, 2766341737943, 16821898891161, 102292597556417, 622032957080238, 3782531767515293
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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) = 5*a(n-1) +6*a(n-2) +10*a(n-3) -29*a(n-4) -59*a(n-5) -27*a(n-6) -46*a(n-7) +21*a(n-8) -8*a(n-9) +52*a(n-10) -16*a(n-11) for n>12
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EXAMPLE
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Some solutions for n=5
..0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..1. .0..1..0. .0..1..1
..0..0..1. .0..1..0. .0..1..0. .0..1..0. .1..1..1. .0..0..0. .0..0..0
..1..1..1. .0..0..0. .0..0..0. .1..1..1. .1..1..1. .0..0..0. .0..0..0
..1..1..1. .0..0..0. .0..0..0. .1..1..1. .1..0..1. .1..0..1. .0..1..0
..1..0..1. .0..1..0. .0..1..1. .1..0..1. .1..0..0. .0..0..0. .0..0..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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