A208349 Number of n X 4 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).

15, 868, 12625, 230387, 4773885, 103672036, 2280287753, 50481169071, 1122098238432, 24983185355723, 556622494082921, 12405478452873059, 276529980588607690, 6164555722628477878, 137428302821781111484

Offset: 1

Author

R. H. Hardin Feb 25 2012

Keywords

• nonn

Comments

Column 4 of A208353.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..129

Crossrefs

Cf. A208353.