A229684 Number of defective 3-colorings of an n X 7 0..2 array connected diagonally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.

0, 101376, 7952256, 437924880, 21063718224, 937213830720, 39647663129952, 1617006498774912, 64143524707305984, 2489243835565159488, 94897266574306915296, 3564781098414437505600, 132254323024723203273120

Offset

1,2

Comments

Column 7 of A229685.

Links

R. H. Hardin, Table of n, a(n) for n = 1..172

R. H. Hardin, Empirical recurrence of order 46

Formula

Empirical recurrence of order 46 (see link above).

Example

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

Crossrefs

Sequence in context: A354566 A251959 A250631 * A187642 A023077 A077760

Adjacent sequences: A229681 A229682 A229683 * A229685 A229686 A229687

Keyword

nonn

Author

R. H. Hardin, Sep 27 2013

Status

approved