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A302422
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Number of nX3 0..1 arrays with every element equal to 0, 1, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
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1
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3, 9, 11, 21, 51, 93, 207, 517, 1007, 2333, 5847, 11781, 27055, 66861, 137895, 314197, 766367, 1610429, 3649239, 8799333, 18772687, 42381645, 101181063, 218513269, 492148223, 1164905693, 2540589879, 5713965957, 13425837103, 29512490349
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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) +10*a(n-3) -8*a(n-4) for n>9
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EXAMPLE
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Some solutions for n=5
..0..0..1. .0..0..1. .0..0..1. .0..1..0. .0..1..0. .0..1..1. .0..1..1
..0..1..0. .0..1..0. .0..1..0. .0..1..0. .1..1..0. .1..0..1. .0..0..0
..1..1..1. .0..1..0. .0..1..0. .0..1..0. .1..1..1. .1..0..1. .0..1..0
..1..1..0. .0..1..1. .1..1..0. .0..1..0. .0..1..0. .1..0..1. .0..1..0
..0..1..0. .0..1..0. .0..1..0. .1..0..0. .1..0..0. .1..0..1. .0..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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