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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 Sequence in context: A185289 A326011 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 20 11:06 EST 2020. Contains 331083 sequences. (Running on oeis4.)