A216464 Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of a 6Xn array with new integer colors introduced in row major order.

5, 52, 1335, 115975, 20880505, 6423127757, 3030359756694, 2043836470040286

Offset: 1

Author

R. H. Hardin Sep 07 2012

Keywords

• nonn

Comments

Row 6 of A216460

Examples

			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..0....x..2..x..3....x..2..x..3....x..2..x..3
..3..x..4..x....3..x..4..x....4..x..0..x....1..x..4..x....4..x..1..x
..x..2..x..3....x..2..x..1....x..5..x..4....x..2..x..0....x..5..x..0
..1..x..0..x....5..x..6..x....1..x..3..x....3..x..1..x....6..x..7..x
..x..2..x..1....x..1..x..3....x..4..x..5....x..2..x..0....x..4..x..2