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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

Table of n, a(n) for n=1..21.

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.)