A216465 Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of a 7Xn array with new integer colors introduced in row major order.

15, 203, 36401, 4213597, 8195008751, 3376465219485, 22530453266592757, 20538493137072741201

Offset: 1

Author

R. H. Hardin Sep 07 2012

Keywords

• nonn

Comments

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