A229688 Number of defective 3-colorings of an n X n 0..2 array connected horizontally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.

0, 3, 626, 80757, 17724789, 7551515197, 6749642728251, 13137498602431137, 56959853494513069323, 558086310754870843057446, 12478933741531750768879884477, 641265228914623466199892311965220

Offset

1,2

Comments

Diagonal of A229694.

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=3:
  0 1 2   0 1 0   0 1 0   0 1 0   0 1 2   0 0 1   0 1 0
  0 2 0   2 2 1   1 2 1   0 2 2   2 0 0   0 2 0   1 0 1
  1 2 2   0 0 1   2 0 2   0 2 1   0 1 0   1 2 1   1 0 2

Crossrefs

Sequence in context: A225761 A140029 A161964 * A287890 A091261 A332163

Adjacent sequences: A229685 A229686 A229687 * A229689 A229690 A229691

Keyword

nonn,more

Author

R. H. Hardin, Sep 27 2013

Status

approved