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A230521
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Number of nX3 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero
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1
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0, 78, 1408, 29618, 627350, 13230788, 279167078, 5890518102, 124290232064, 2622533790338, 55335676702862, 1167587239742436, 24636184990146910, 519825491749928782, 10968359831136839008, 231433277698034342442
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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) = 17*a(n-1) +74*a(n-2) +257*a(n-3) +159*a(n-4) -208*a(n-5) -590*a(n-6) -120*a(n-7) +48*a(n-8) +48*a(n-9)
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EXAMPLE
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Some solutions for n=3
..0..2..1....0..1..0....0..2..1....0..1..2....0..2..0....0..1..0....0..1..0
..2..1..1....2..2..0....1..0..0....0..0..1....1..1..0....2..2..0....2..2..2
..1..0..2....0..1..1....2..2..2....2..0..2....1..2..1....1..1..0....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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