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A316578
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Number of nX3 0..1 arrays with every element unequal to 1, 2, 3, 4, 7 or 8 king-move adjacent elements, with upper left element zero.
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1
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1, 23, 63, 338, 1312, 5936, 25271, 110555, 478290, 2079671, 9022567, 39184505, 170094043, 738520371, 3206190960, 13919960703, 60433331958, 262373351014, 1139097162102, 4945415596141, 21470609436976, 93215075154612
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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) = a(n-1) +13*a(n-2) +12*a(n-3) -18*a(n-4) -27*a(n-5) +4*a(n-6) +19*a(n-7) +31*a(n-8) -3*a(n-10) -3*a(n-11) -14*a(n-12) -6*a(n-14) +4*a(n-15) for n>16
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EXAMPLE
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Some solutions for n=5
..0..0..0. .0..1..0. .0..1..0. .0..1..1. .0..0..1. .0..1..1. .0..1..1
..0..1..0. .0..1..1. .1..0..1. .0..1..0. .0..1..1. .0..0..0. .1..0..0
..1..0..0. .1..1..1. .0..1..0. .1..0..1. .1..1..0. .0..1..0. .1..0..0
..1..0..0. .1..0..1. .1..0..1. .0..0..0. .1..0..1. .1..0..0. .0..0..1
..0..0..1. .0..1..1. .1..0..0. .0..1..1. .0..0..0. .0..1..1. .1..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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