A216758 Number of horizontal, vertical, diagonal, antidiagonal or knight-move neighbor colorings of an nX3 array with new integer colors introduced in row major order

2, 4, 60, 2957, 337731, 71786149, 24889021634, 12901134791995

Offset

1,1

Comments

Column 3 of A216760

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=4
..0..1..0....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2
..2..3..4....3..4..5....3..4..5....3..4..3....3..4..5....3..4..5....3..4..5
..5..1..6....6..1..7....0..6..2....2..5..2....2..1..6....2..6..2....6..7..2
..7..0..2....0..8..3....7..1..3....1..0..1....5..7..0....5..0..5....8..4..8

Crossrefs

Sequence in context: A242737 A018348 A001625 * A018352 A121059 A139160

Adjacent sequences: A216755 A216756 A216757 * A216759 A216760 A216761

Keyword

nonn

Author

R. H. Hardin Sep 15 2012

Status

approved