A222872 Number of nX2 0..3 arrays with no more than floor(nX2/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

1, 11, 131, 2150, 32491, 533186, 8362152, 135650378, 2155759835, 34780282521, 555913562689, 8947148045345, 143379589806584, 2305060329759954, 36982483115935396, 594232174227590798, 9538759468134692551

Offset: 1

Author

R. H. Hardin Mar 08 2013

Keywords

• nonn

Comments

Column 2 of A222878

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210