A216693 Number of horizontal, vertical, diagonal or knight-move neighbor colorings of an nX4 array with new integer colors introduced in row major order

5, 90, 11730, 6901440, 11239872497

Offset

1,1

Comments

Column 4 of A216694

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for n=2
..0..1..2..3....0..1..0..1....0..1..2..3....0..1..0..2....0..1..0..2
..4..5..6..0....2..3..4..5....4..5..4..5....3..4..3..4....2..3..4..3

Crossrefs

Sequence in context: A295766 A361586 A367500 * A158073 A038636 A282052

Adjacent sequences: A216690 A216691 A216692 * A216694 A216695 A216696

Keyword

nonn

Author

R. H. Hardin Sep 14 2012

Status

approved