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A317460
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Number of nX3 0..1 arrays with every element unequal to 2, 3, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
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1
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0, 5, 16, 107, 636, 3893, 23769, 145280, 887980, 5428139, 33181694, 202838254, 1239944574, 7579749355, 46334824959, 283243696481, 1731462085879, 10584387302544, 64702112676461, 395522505704920, 2417819853246711
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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) = 5*a(n-1) +8*a(n-2) +2*a(n-3) -48*a(n-4) -62*a(n-5) +35*a(n-6) +62*a(n-7) +5*a(n-8) -25*a(n-9) +2*a(n-10) +14*a(n-11) +4*a(n-12) for n>14
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EXAMPLE
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Some solutions for n=5
..0..0..0. .0..0..1. .0..0..0. .0..1..0. .0..1..0. .0..1..0. .0..0..1
..1..1..1. .1..1..0. .1..1..1. .1..1..0. .1..1..0. .1..1..0. .1..1..0
..1..0..1. .0..0..0. .0..1..0. .0..1..0. .0..1..0. .0..1..0. .0..1..1
..1..0..0. .0..1..0. .1..1..1. .1..0..0. .0..1..1. .1..1..0. .1..0..1
..0..1..1. .1..0..1. .0..1..0. .1..0..1. .1..0..0. .0..0..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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