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A316540
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Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 4, 7 or 8 king-move adjacent elements, with upper left element zero.
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1
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4, 12, 26, 53, 187, 484, 1262, 3570, 9751, 26557, 72773, 199700, 546815, 1496934, 4102867, 11240497, 30788845, 84352649, 231098249, 633098685, 1734421624, 4751634729, 13017502145, 35662487018, 97700580311, 267659337870
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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) = a(n-1) +3*a(n-2) +8*a(n-3) -a(n-4) -12*a(n-5) -26*a(n-6) -2*a(n-7) +10*a(n-8) +15*a(n-9) -a(n-10) +6*a(n-11) for n>12
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EXAMPLE
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Some solutions for n=5
..0..1..0. .0..1..1. .0..0..1. .0..0..0. .0..1..1. .0..0..1. .0..0..1
..0..0..1. .0..0..0. .0..0..1. .0..1..0. .0..1..1. .1..1..1. .1..1..1
..0..0..0. .0..1..1. .0..0..0. .0..1..0. .1..1..1. .1..1..1. .1..1..1
..0..0..0. .0..0..0. .0..0..1. .0..0..0. .1..0..1. .0..0..1. .1..1..0
..0..1..1. .0..1..1. .0..1..0. .0..0..0. .1..0..1. .1..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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