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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 0
2, 4, 60, 2957, 337731, 71786149, 24889021634, 12901134791995 (list; graph; refs; listen; history; text; internal format)
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

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Last modified November 18 01:03 EST 2018. Contains 317279 sequences. (Running on oeis4.)