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A216660 Number of horizontal, vertical or knight-move neighbor colorings of an nX2 array with new integer colors introduced in row major order 0
1, 4, 25, 279, 4800, 116635, 3760019, 153831836, 7730921915, 465562795125, 32949873078160, 2698248029796465, 252407175864930849, 26685021081300144340 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A216663

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=3

..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1

..2..3....2..3....2..0....1..2....1..0....2..0....2..3....2..0....2..3....2..3

..0..2....4..1....0..2....0..3....2..3....0..1....3..1....3..1....0..4....3..4

CROSSREFS

Sequence in context: A144281 A320569 A058791 * A238510 A222982 A259591

Adjacent sequences:  A216657 A216658 A216659 * A216661 A216662 A216663

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 13 2012

STATUS

approved

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Last modified January 27 08:31 EST 2020. Contains 331293 sequences. (Running on oeis4.)