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A229691
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Number of defective 3-colorings of an nX5 0..2 array connected horizontally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order
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1
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12, 1171, 35825, 848937, 17724789, 342532665, 6279934941, 110801828529, 1898544262293, 31786996628745, 522316663574733, 8450380115641377, 134940473888031045, 2130891564532483449, 33326706458497564413
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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) = 45*a(n-1) -729*a(n-2) +4995*a(n-3) -13122*a(n-4) +14580*a(n-5) -5832*a(n-6) for n>7.
Empirical: 12*x -x^2*(-1171+16870*x-90471*x^2+210096*x^3-212220*x^4+81648*x^5) / (18*x^2-15*x+1)^3. - R. J. Mathar, Sep 29 2013
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EXAMPLE
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Some solutions for n=3
..0..1..0..1..0....0..1..2..1..0....0..1..0..1..2....0..1..2..0..1
..0..1..0..1..2....2..1..0..1..2....2..1..2..0..2....0..2..1..0..2
..0..0..2..1..2....2..1..1..0..2....0..2..1..1..0....1..2..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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