A215899 Number of diagonal and antidiagonal neighbor colorings of the even squares of an n X n array with new integer colors introduced in row major order

1, 1, 15, 602, 2387217, 33093356640, 148049909203591059

Offset

1,3

Comments

Diagonal of A215904

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=3
..0..x..0....0..x..0....0..x..0....0..x..1....0..x..1....0..x..1....0..x..1
..x..1..x....x..1..x....x..1..x....x..2..x....x..2..x....x..2..x....x..2..x
..2..x..2....2..x..0....2..x..3....1..x..3....3..x..3....0..x..0....1..x..0

Crossrefs

Sequence in context: A294834 A276489 A243227 * A027505 A012210 A203172

Adjacent sequences: A215896 A215897 A215898 * A215900 A215901 A215902

Keyword

nonn

Author

R. H. Hardin Aug 26 2012

Status

approved