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A297696
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Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 2 or 4 neighboring 1s.
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1
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8, 19, 95, 293, 1244, 4277, 16931, 61040, 234262, 862457, 3264643, 12131248, 45639021, 170292842, 638909917, 2388332666, 8949721529, 33482510155, 125400009557, 469313539433, 1757268204363, 6577689516815, 24626450519312
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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) = 3*a(n-1) +10*a(n-2) -24*a(n-3) -24*a(n-4) +43*a(n-5) +22*a(n-6) -17*a(n-7) -4*a(n-8) +2*a(n-9)
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EXAMPLE
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Some solutions for n=7
..1..1..0..1..0..0..0. .1..0..0..0..0..0..0. .1..1..1..1..1..1..1
..0..1..1..1..1..0..1. .1..0..0..0..1..0..0. .0..1..0..1..0..1..0
..0..0..0..0..0..0..0. .1..0..0..1..1..1..0. .1..1..1..1..1..1..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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