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A233014
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Number of nX4 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally or vertically, top left element zero, and 1 appearing before 2 in row major order
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1
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14, 515, 19643, 750092, 28644884, 1093911305, 41775098873, 1595338735322, 60923990363594, 2326610975034335, 88850362536855143, 3393084193289939192, 129577640587140970544, 4948407992160122812805, 188973510753274141448453
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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) = 46*a(n-1) -312*a(n-2) +530*a(n-3) -263*a(n-4)
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EXAMPLE
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Some solutions for n=3
..0..1..1..3....0..1..1..3....0..0..1..0....0..1..0..1....0..0..1..0
..1..1..1..3....0..0..0..1....1..1..0..2....1..3..2..3....0..1..0..0
..3..3..1..1....2..2..2..3....3..1..1..0....3..1..0..1....0..0..2..2
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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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