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 A229573 Number of defective 4-colorings of an n X 3 0..3 array connected horizontally, vertically, diagonally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..3 order. 1
 2, 26, 76, 171, 362, 757, 1584, 3323, 6982, 14673, 30812, 64615, 135282, 282749, 589960, 1228947, 2556062, 5308585, 11010228, 22806719, 47186122, 97517781, 201326816, 415236331, 855638262, 1761607937, 3623878924, 7449084183 (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) = 6*a(n-1) - 13*a(n-2) + 12*a(n-3) - 4*a(n-4) for n>5. Empirical g.f.: x*(2 + 14*x - 54*x^2 + 29*x^3 + 20*x^4) / ((1 - x)^2*(1 - 2*x)^2). - Colin Barker, Sep 19 2018 EXAMPLE Some solutions for n=3: ..0..0..1....0..1..0....0..0..1....0..1..0....0..1..1....0..1..2....0..1..2 ..2..3..2....2..2..3....1..2..3....2..3..2....2..3..2....2..3..0....2..1..3 ..1..0..1....3..1..0....3..0..1....0..1..2....1..0..1....1..1..2....3..0..2 CROSSREFS Column 3 of A229578. Sequence in context: A247957 A152997 A345693 * A337396 A067204 A202077 Adjacent sequences:  A229570 A229571 A229572 * A229574 A229575 A229576 KEYWORD nonn AUTHOR R. H. Hardin, Sep 26 2013 STATUS approved

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Last modified August 15 15:55 EDT 2022. Contains 356148 sequences. (Running on oeis4.)