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A216339 Number of horizontal and antidiagonal neighbor colorings of the even squares of a 3Xn array with new integer colors introduced in row major order 1
2, 3, 15, 42, 602, 2440, 61915, 322776, 12297978, 77360796, 4044784633, 29562890886, 2004648242718, 16604827619828, 1404640885455993, 12954736337254696, 1328741141974378250, 13465808369740333664 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A216338

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..41

EXAMPLE

Some solutions for n=4

..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x

..x..2..x..3....x..2..x..0....x..2..x..3....x..2..x..3....x..2..x..0

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

CROSSREFS

Sequence in context: A037388 A298370 A221860 * A048076 A203432 A298409

Adjacent sequences:  A216336 A216337 A216338 * A216340 A216341 A216342

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 04 2012

STATUS

approved

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Last modified August 7 12:01 EDT 2022. Contains 355985 sequences. (Running on oeis4.)