A215920 Number of diagonal and antidiagonal neighbor colorings of the odd squares of an n X n array with new integer colors introduced in row major order.

1, 1, 4, 602, 322768, 33093356640, 12954733199158688, 2562708954818067388122544

Offset: 1

Author

R. H. Hardin Aug 27 2012

Keywords

• nonn

Comments

Diagonal of A215924

Examples

			Some solutions for n=4
..x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..0
..1..x..2..x....1..x..2..x....2..x..3..x....1..x..2..x....1..x..2..x
..x..0..x..0....x..3..x..1....x..0..x..0....x..0..x..1....x..0..x..0
..3..x..2..x....4..x..4..x....4..x..1..x....3..x..4..x....3..x..1..x