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A299329
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Number of nX3 0..1 arrays with every element equal to 2, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
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1
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0, 3, 8, 36, 173, 858, 4258, 21386, 107465, 541047, 2725498, 13733762, 69215100, 348852964, 1758324488, 8862635135, 44671460074, 225164071583, 1134929377517, 5720565544510, 28834291127949, 145338167739511, 732571679461791
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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) = 4*a(n-1) +10*a(n-2) -13*a(n-3) -53*a(n-4) -25*a(n-5) +57*a(n-6) +53*a(n-7) +a(n-8) +16*a(n-9) +10*a(n-10) -15*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..1..1. .0..1..1. .0..0..0. .0..0..1. .0..0..0. .0..0..0. .0..1..1
..0..0..1. .0..0..1. .0..0..1. .0..1..1. .0..0..0. .0..1..0. .0..0..1
..0..1..1. .0..0..0. .0..1..1. .1..1..1. .0..1..0. .1..0..1. .1..1..0
..0..1..1. .0..1..0. .0..1..0. .1..0..0. .0..1..1. .1..1..0. .0..1..0
..0..0..1. .1..1..1. .0..0..0. .0..0..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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