A216692 Number of horizontal, vertical, diagonal or knight-move neighbor colorings of an nX3 array with new integer colors introduced in row major order

2, 9, 189, 11730, 1561834, 370625430, 139733635588

Offset

1,1

Comments

Column 3 of A216694

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=2
..0..1..2....0..1..2....0..1..2....0..1..0....0..1..2....0..1..2....0..1..0
..3..4..3....3..4..5....3..2..4....2..3..2....3..2..3....1..3..4....1..2..3

Crossrefs

Sequence in context: A078524 A041795 A123625 * A367901 A069649 A111832

Adjacent sequences: A216689 A216690 A216691 * A216693 A216694 A216695

Keyword

nonn

Author

R. H. Hardin Sep 14 2012

Status

approved