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A297460
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Number of 4Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0 or 2 neighboring 1s.
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1
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16, 48, 390, 1677, 10579, 52714, 303202, 1595942, 8870125, 47677361, 261582358, 1417183936, 7737647802, 42045961903, 229144537845, 1246564200638, 6788893506436, 36947833081238, 201168409801195, 1095013593863467
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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) = 4*a(n-1) +15*a(n-2) -32*a(n-3) -18*a(n-4) -113*a(n-5) -37*a(n-6) +422*a(n-7) -77*a(n-8) +349*a(n-9) +165*a(n-10) -118*a(n-11) -14*a(n-12) -48*a(n-13) -2*a(n-14) +8*a(n-15)
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EXAMPLE
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Some solutions for n=6
..1..0..1..0..0..1. .0..0..0..1..0..0. .1..1..1..0..0..0. .0..0..1..0..0..0
..1..0..0..0..0..1. .0..0..0..0..0..1. .0..1..0..0..0..0. .0..0..0..0..1..0
..1..0..1..1..0..0. .1..0..1..1..0..1. .0..1..0..0..1..1. .0..1..0..0..0..0
..1..0..1..1..0..1. .1..0..1..1..0..0. .0..0..0..1..1..0. .0..1..0..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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