A229664 - OEIS

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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, 4, 1555, 328160, 78681904, 29775277216, 20240623720512, 26289798524244224, 67473235330524263424

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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 * A361449 A265661 A280793

Adjacent sequences: A229661 A229662 A229663 * A229665 A229666 A229667

KEYWORD

nonn,more

AUTHOR

R. H. Hardin, Sep 27 2013

STATUS

approved