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A297811
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Number of nX5 0..1 arrays with every element equal to 2 or 3 king-move adjacent elements, with upper left element zero.
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1
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0, 8, 0, 13, 24, 41, 39, 109, 216, 471, 883, 1826, 3771, 7957, 16180, 33265, 68409, 141908, 292327, 602447, 1240608, 2561035, 5282041, 10893334, 22455433, 46313241, 95513864, 196987195, 406204281, 837692722, 1727540167, 3562722575, 7347181938
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 2*a(n-1) +a(n-2) -2*a(n-3) +4*a(n-4) -4*a(n-5) -8*a(n-6) -a(n-7) +5*a(n-8) +a(n-9) +4*a(n-10) +a(n-11) -3*a(n-12) for n>21
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EXAMPLE
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Some solutions for n=7
..0..0..1..1..1. .0..0..0..1..1. .0..0..1..0..0. .0..0..0..0..0
..0..1..0..0..1. .0..1..1..0..1. .0..1..0..1..0. .0..1..1..1..0
..0..1..0..1..0. .1..0..0..0..1. .0..1..0..1..0. .1..0..0..0..1
..0..1..0..1..0. .0..1..1..1..0. .1..0..1..0..1. .0..1..1..1..0
..0..1..0..1..0. .1..0..0..0..1. .1..0..1..0..1. .1..0..0..0..1
..1..0..0..1..0. .0..1..1..0..1. .0..1..1..0..1. .0..1..1..1..0
..1..1..1..0..0. .0..0..0..1..1. .0..0..0..1..1. .0..0..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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