A183818 1/81 the number of (n+1)X8 0..2 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.

262144, 536415300, 1050517114472, 2096961683069192, 4156740912572653752

Offset: 1

Author

R. H. Hardin Jan 07 2011

Keywords

• nonn

Comments

Column 7 of A183819

Examples

			Some solutions with upper left block zero for 3X8
..0..0..0..2..0..2..0..2....0..0..0..1..0..1..0..1....0..0..0..1..0..0..0..2
..0..0..1..1..0..2..1..0....0..0..1..1..0..2..1..0....0..0..1..2..0..2..1..0
..2..1..0..1..0..1..0..1....1..1..0..0..0..0..0..0....1..1..1..2..0..1..0..1