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A229664 Number of defective 4-colorings of an n X n 0..3 array connected horizontally, antidiagonally and vertically with exactly two mistakes, and colors introduced in row-major 0..3 order. 0
0, 4, 1555, 328160, 78681904, 29775277216, 20240623720512, 26289798524244224, 67473235330524263424 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A229672.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=3:

  0 1 0   0 1 2   0 1 2   0 0 1   0 1 2   0 1 2   0 0 1

  2 2 3   3 1 0   0 1 3   2 3 0   3 3 0   1 3 0   2 0 3

  1 3 2   2 0 1   3 0 2   0 1 0   0 2 2   3 1 3   3 1 2

CROSSREFS

Sequence in context: A203035 A030253 A278549 * A265661 A280793 A160225

Adjacent sequences:  A229661 A229662 A229663 * A229665 A229666 A229667

KEYWORD

nonn,more

AUTHOR

R. H. Hardin, Sep 27 2013

STATUS

approved

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Last modified October 19 07:29 EDT 2021. Contains 348074 sequences. (Running on oeis4.)