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A297683
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Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 1 or 4 neighboring 1s.
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1
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8, 33, 150, 629, 2790, 12110, 52889, 230406, 1005170, 4382278, 19110183, 83327912, 363357551, 1584416863, 6908888883, 30126285845, 131366174343, 572824066436, 2497808102429, 10891729292407, 47493549245614, 207096331298600
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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) = 2*a(n-1) +7*a(n-2) +11*a(n-3) +17*a(n-4) -7*a(n-5) -10*a(n-6) -18*a(n-7) -a(n-8)
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EXAMPLE
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Some solutions for n=7
..0..1..0..0..0..0..1. .0..0..0..1..0..0..0. .0..0..1..0..0..0..1
..1..0..0..0..0..1..1. .0..0..0..1..0..0..0. .1..0..0..0..0..0..0
..0..0..0..0..1..0..1. .0..0..0..0..1..0..1. .1..0..1..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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