A223042 Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

2, 8, 98, 1265, 17356, 241583, 3395532, 48048796, 683306658, 9759462283, 139866408792, 2010279482902, 28963821801648, 418182844095108, 6048773850787538, 87632133398349504, 1271377018275506438

Offset: 1

Author

R. H. Hardin Mar 12 2013

Keywords

• nonn

Comments

Row 2 of A223041

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..61