A216456 - OEIS

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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

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