A216343 Number of horizontal and antidiagonal neighbor colorings of the even squares of a 7Xn array with new integer colors introduced in row major order.

15, 409, 115975, 18378580, 41521045376, 20358402201792, 148049849072167133, 152834688133255075552, 2562708952364833106990692

Offset: 1

Author

R. H. Hardin Sep 04 2012

Keywords

• nonn

Comments

Row 7 of A216338

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