A215843 Number of horizontal, vertical, 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, 4, 78, 159712, 1396243937, 3815473909467500, 45390943862783143279730, 397034361835031697465783534020014, 15507107984840512941104718700286316624403232, 879811362496064190233012463916172065914614436408327993774, 228191793894588365948208713657625336579386337610734511061398668053881111

Offset

1,3

Comments

Diagonal of A215847.

Links

Table of n, a(n) for n=1..12.

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

Crossrefs

Sequence in context: A246606 A210903 A054951 * A048957 A006425 A065930

Adjacent sequences: A215840 A215841 A215842 * A215844 A215845 A215846

Keyword

nonn

Author

R. H. Hardin, Aug 24 2012

Extensions

a(7)-a(12) from Andrew Howroyd, Jun 25 2017

Status

approved