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A303464
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Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
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1
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4, 29, 170, 1033, 6369, 39098, 240109, 1476141, 9071642, 55751425, 342663945, 2106046874, 12944002597, 79556015733, 488963529146, 3005245731481, 18470721790257, 113523996378746, 697736565265309, 4288400399533821
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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) = 7*a(n-1) -5*a(n-2) +20*a(n-3) -144*a(n-4) +72*a(n-5) for n>6
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EXAMPLE
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Some solutions for n=5
..0..1..0. .0..0..1. .0..0..1. .0..0..1. .0..1..1. .0..0..1. .0..1..0
..1..1..1. .1..1..1. .1..0..1. .0..1..0. .0..0..1. .1..0..1. .1..1..0
..0..0..0. .1..1..1. .1..0..0. .1..0..0. .1..0..1. .1..0..1. .0..0..0
..1..0..0. .1..0..0. .0..1..0. .0..0..0. .0..0..0. .1..1..0. .1..0..1
..1..1..1. .1..0..1. .0..1..1. .1..0..1. .0..1..1. .1..0..1. .1..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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