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A297655
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Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 2 or 3 neighboring 1s.
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1
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1, 10, 43, 140, 494, 1845, 6757, 24479, 89068, 324765, 1182996, 4307440, 15687513, 57137761, 208098949, 757896766, 2760293603, 10053139616, 36613986582, 133349718469, 485665707449, 1768816633099, 6442109942616, 23462454583677
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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) = 3*a(n-1) -2*a(n-2) +13*a(n-3) +6*a(n-4) +12*a(n-5) +12*a(n-6)
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EXAMPLE
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Some solutions for n=7
..1..1..1..0..1..1..0. .0..1..1..0..0..1..1. .0..1..1..0..1..1..1
..0..0..0..1..0..0..1. .1..0..0..1..0..0..1. .1..0..0..1..1..1..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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