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 A229455 Number of defective 3-colorings of an n X 4 0..2 array connected horizontally and vertically with exactly one mistake and colors introduced in row-major 0..2 order. 1
 6, 84, 863, 7940, 68790, 573342, 4651079, 36985536, 289643385, 2240964186, 17168776578, 130470758748, 984730068189, 7389045257436, 55166274822951, 410065744877280, 3036389212951326, 22406600046050874, 164842346594552499 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 18*a(n-1) - 111*a(n-2) + 282*a(n-3) - 333*a(n-4) + 180*a(n-5) - 36*a(n-6) for n>7. Empirical g.f.: x*(6 - 24*x + 17*x^2 + 38*x^3 - 27*x^4 - 12*x^5 + 8*x^6) / (1 - 9*x + 15*x^2 - 6*x^3)^2. - Colin Barker, Sep 17 2018 EXAMPLE Some solutions for n=3: ..0..1..0..1....0..1..0..1....0..1..2..1....0..1..1..2....0..1..2..1 ..2..0..1..0....2..0..1..2....2..0..1..2....1..2..0..1....1..0..1..0 ..0..1..2..2....2..1..2..1....1..2..2..0....2..0..1..2....2..0..2..1 CROSSREFS Column 4 of A229460. Sequence in context: A054605 A119576 A098982 * A212701 A248338 A144514 Adjacent sequences:  A229452 A229453 A229454 * A229456 A229457 A229458 KEYWORD nonn AUTHOR R. H. Hardin, Sep 24 2013 STATUS approved

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Last modified October 22 22:34 EDT 2019. Contains 328335 sequences. (Running on oeis4.)