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A299816
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Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
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1
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1, 13, 39, 202, 894, 4507, 22684, 116651, 605727, 3159382, 16537678, 86697810, 454970673, 2388855177, 12546612125, 65907887547, 346249228930, 1819128113520, 9557636406332, 50216318435526, 263841572707504, 1386257187235490
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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) = 6*a(n-1) +4*a(n-2) -39*a(n-3) -35*a(n-4) +109*a(n-5) +37*a(n-6) -129*a(n-7) +69*a(n-8) +95*a(n-9) -110*a(n-10) +6*a(n-11) -20*a(n-12) -28*a(n-13) +6*a(n-14) for n>16
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EXAMPLE
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Some solutions for n=5
..0..0..0. .0..0..0. .0..0..0. .0..1..1. .0..0..0. .0..0..0. .0..0..0
..0..0..1. .0..0..0. .0..0..0. .0..0..1. .0..0..0. .0..1..0. .0..0..0
..1..1..1. .0..0..0. .0..0..0. .1..1..1. .0..0..0. .1..1..1. .0..0..0
..1..1..1. .0..0..0. .0..1..1. .1..1..1. .0..1..1. .1..1..1. .1..1..1
..1..1..1. .0..0..0. .1..1..0. .1..1..1. .1..1..1. .1..1..1. .0..1..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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