A223043 Number of 3Xn 0..3 arrays with no more than floor(3Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

5, 105, 3780, 229437, 8580619, 545607733, 20971228220, 1358651862708, 53077561321144, 3474963120998767, 137187655129561217, 9041338739497666603, 359601802489393277805, 23807690292325473464228, 952177664603231816246021

Offset: 1

Author

R. H. Hardin Mar 12 2013

Keywords

• nonn

Comments

Row 3 of A223041

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..19