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A221667
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Sum of neighbor maps: number of 2 X n binary arrays indicating the locations of corresponding elements equal to the sum mod 3 of their horizontal, diagonal and antidiagonal neighbors in a random 0..2 2 X n array.
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1
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4, 12, 64, 256, 992, 4096, 16384, 65344, 262144, 1048576, 4193280, 16777216, 67108864, 268430336, 1073741824, 4294967296, 17179844608, 68719476736, 274877906944, 1099511513088, 4398046511104, 17592186044416, 70368743653376
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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) + 8*a(n-3) - 32*a(n-4) - 16*a(n-6) + 64*a(n-7).
Empirical g.f.: 4*x*(1 - x + 4*x^2 - 8*x^3 + 16*x^6) / ((1 - 4*x)*(1 - 4*x^3)^2). - Colin Barker, Aug 10 2018
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EXAMPLE
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Some solutions for n=3:
..0..0..0....0..1..0....0..1..1....0..1..1....1..1..0....0..0..1....1..0..1
..1..1..1....0..1..0....0..1..1....0..1..0....1..1..1....0..1..1....0..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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