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A215900 Number of diagonal and antidiagonal neighbor colorings of the even squares of an nX3 array with new integer colors introduced in row major order 1
2, 2, 15, 42, 726, 2906, 84550, 433252, 18378580, 113503692, 6485270720, 46538017584, 3404551437592, 27700815674032, 2504332323669064, 22702140562948192, 2470653950084307472, 24626774613248937584 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A215904

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..96

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A329920 A006929 A216613 * A264838 A184718 A079897

Adjacent sequences:  A215897 A215898 A215899 * A215901 A215902 A215903

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 26 2012

STATUS

approved

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Last modified October 22 22:22 EDT 2020. Contains 337962 sequences. (Running on oeis4.)