A216609 Number of horizontal, diagonal and antidiagonal neighbor colorings of the odd squares of an nX3 array with new integer colors introduced in row major order.

1, 1, 2, 20, 67, 1335, 6097, 192713, 1094076, 49055292, 329588907, 19602119017, 151146594991, 11399696350555, 98774751736976, 9146845346099410, 87700687826082507, 9731199828137067515, 102042888281439150263

Offset

1,3

Comments

Column 3 of A216612

Links

R. H. Hardin, Table of n, a(n) for n = 1..97

Example

Some solutions for n=4
..x..0..x....x..0..x....x..0..x....x..0..x....x..0..x....x..0..x....x..0..x
..1..x..2....1..x..2....1..x..2....1..x..2....1..x..2....1..x..2....1..x..2
..x..3..x....x..3..x....x..3..x....x..0..x....x..3..x....x..0..x....x..0..x
..4..x..1....0..x..1....0..x..4....3..x..1....4..x..0....2..x..3....1..x..2

Crossrefs

Sequence in context: A136905 A230644 A183907 * A226394 A287485 A003283

Adjacent sequences: A216606 A216607 A216608 * A216610 A216611 A216612

Keyword

nonn

Author

R. H. Hardin, Sep 10 2012

Status

approved