A208346 Number of n X n 0..3 arrays with new values 0..3 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors).

1, 15, 1095, 230387, 191586797, 647640659639

Offset: 1

Author

R. H. Hardin Feb 25 2012

Keywords

• nonn

Comments

Diagonal of A208353

Examples

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