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A216456 Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of an n X n array with new integer colors introduced in row major order 0
1, 1, 7, 203, 580479, 6423127757, 22530453266592757 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A216460

LINKS

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

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

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

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

CROSSREFS

Sequence in context: A292332 A177813 A292338 * A243144 A234619 A308614

Adjacent sequences:  A216453 A216454 A216455 * A216457 A216458 A216459

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 07 2012

STATUS

approved

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Last modified September 20 04:23 EDT 2020. Contains 337264 sequences. (Running on oeis4.)