A222880 Number of 3Xn 0..3 arrays with no more than floor(3Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

5, 131, 6282, 409775, 19707855, 1340197778, 66248732403, 4552388850792, 228017377191609, 15767959380970741, 797585318305106129, 55339415802965980962, 2819443488435447752525, 196019624814751455019691

Offset: 1

Author

R. H. Hardin Mar 08 2013

Keywords

• nonn

Comments

Row 3 of A222878

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..22