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

2, 2, 15, 42, 726, 2906, 84550, 433252, 18378580, 113503692, 6485270720, 46538017584, 3404551437592, 27700815674032, 2504332323669064, 22702140562948192, 2470653950084307472, 24626774613248937584

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