A222682 Number of 4Xn 0..3 arrays with no more than floor(4Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

15, 18, 130, 527, 5374, 58167, 687222, 11377192, 157746714, 2877417604, 41716355254, 762816679067, 11260740512076, 204256746622744, 3052246394940308

Offset: 1

Author

R. H. Hardin Feb 28 2013

Keywords

• nonn

Comments

Row 4 of A222679

Examples

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