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A215921 Number of diagonal and antidiagonal neighbor colorings of the odd squares of an nX3 array with new integer colors introduced in row major order 1
1, 2, 4, 42, 136, 2906, 12840, 433252, 2387180, 113503692, 742181112, 46538017584, 350038464728, 27700815674032, 234578644301776, 22702140562948192, 213078984368820288, 24626774613248937584, 253140626416265149920 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A215924

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..98

EXAMPLE

Some solutions for n=4

..x..0..x....x..0..x....x..0..x....x..0..x....x..0..x....x..0..x....x..0..x

..1..x..2....1..x..1....1..x..2....1..x..1....1..x..2....1..x..2....1..x..1

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

..1..x..1....3..x..1....3..x..4....1..x..1....2..x..2....4..x..5....0..x..1

CROSSREFS

Sequence in context: A103105 A018312 A009547 * A009811 A009591 A009717

Adjacent sequences:  A215918 A215919 A215920 * A215922 A215923 A215924

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 27 2012

STATUS

approved

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Last modified December 1 09:28 EST 2020. Contains 338833 sequences. (Running on oeis4.)