A216331 Number of horizontal and antidiagonal neighbor colorings of the even squares of an n X n array with new integer colors introduced in row major order

1, 2, 15, 726, 2387180, 37060650272, 148049849072167133, 2765650089185458968363718

Offset

1,2

Comments

Diagonal of A216338

Links

Table of n, a(n) for n=1..8.

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

Crossrefs

Sequence in context: A208051 A038017 A012993 * A179432 A007542 A090604

Adjacent sequences: A216328 A216329 A216330 * A216332 A216333 A216334

Keyword

nonn

Author

R. H. Hardin Sep 04 2012

Status

approved