A221137 Number of nX6 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.

16, 9801, 3485689, 1539699121, 619901126244, 259039174953636, 106295637843093924, 43910419047705413284

Offset: 1

Author

R. H. Hardin Jan 02 2013

Keywords

• nonn

Comments

Column 6 of A221139

Examples

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