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

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