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A241365
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Number of nX3 0..2 arrays with no element equal to fewer vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order
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1
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2, 28, 460, 7376, 118488, 1904096, 30598800, 491723328, 7902006144, 126985443680, 2040659387360, 32793449527584, 526991588462752, 8468768559462432, 136093331438385952, 2187023382674637856, 35145522751283965984
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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) = 15*a(n-1) +18*a(n-2) -8*a(n-3) -68*a(n-4) -164*a(n-5) -256*a(n-6) -176*a(n-7) +64*a(n-8)
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EXAMPLE
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Some solutions for n=4
..0..1..2....0..1..0....0..0..1....0..1..0....0..1..2....0..1..0....0..1..0
..0..0..1....2..0..1....0..0..1....0..1..2....1..0..2....0..1..2....1..0..2
..2..0..2....2..1..0....0..0..0....2..1..0....2..0..2....1..0..1....2..0..2
..2..1..2....2..0..2....1..0..0....2..1..0....1..2..0....2..0..2....0..2..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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