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 A229571 Number of defective 4-colorings of an n X n 0..3 array connected horizontally, vertically, diagonally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..3 order. 0
 0, 6, 76, 312, 924, 2440, 6108, 14840, 35356, 83016, 192636, 442552, 1007868, 2277704, 5112220, 11403768, 25297500, 55837384, 122684220, 268436408, 585106492 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A229578. LINKS FORMULA Empirical (for n>=9): a(n) = 9*a(n-1) - 33*a(n-2) + 63*a(n-3) - 66*a(n-4) + 36*a(n-5) - 8*a(n-6). - Vaclav Kotesovec, Feb 14 2014 EXAMPLE Some solutions for n=3:   0 1 2   0 1 0   0 1 0   0 1 1   0 1 0   0 1 0   0 1 2   3 2 3   2 3 2   1 2 3   2 3 2   2 2 3   2 3 3   2 1 0   1 0 1   0 1 2   3 0 1   0 1 0   1 0 1   1 0 1   0 3 2 CROSSREFS Cf. A229578. Sequence in context: A350283 A350411 A263228 * A016090 A181343 A241072 Adjacent sequences:  A229568 A229569 A229570 * A229572 A229573 A229574 KEYWORD nonn AUTHOR R. H. Hardin, Sep 26 2013 STATUS approved

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Last modified January 26 13:42 EST 2022. Contains 350598 sequences. (Running on oeis4.)