A222681 Number of 3Xn 0..3 arrays with no more than floor(3Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

5, 5, 11, 58, 142, 2398, 6463, 146947, 401552, 9871237, 27759999, 675112590, 1962193874, 46428879519, 139050595341, 3201678397354, 9862902257940, 221229238222335, 700012077054917

Offset: 1

Author

R. H. Hardin Feb 28 2013

Keywords

• nonn

Comments

Row 3 of A222679

Examples

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