A183816 1/81 the number of (n+1)X6 0..2 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.

4096, 1321860, 414246824, 131467169720, 41531687999736, 13143529051807800, 4156740912572653752

Offset: 1

Author

R. H. Hardin Jan 07 2011

Keywords

• nonn

Comments

Column 5 of A183819

Examples

			Some solutions with upper left block zero for 3X6
..0..0..0..0..1..2....0..0..0..0..1..2....0..0..0..0..0..2....0..0..0..0..2..0
..0..0..1..1..1..2....0..0..1..2..2..0....0..0..1..2..2..0....0..0..2..1..1..0
..0..1..2..2..1..0....1..2..1..0..2..1....2..1..1..1..2..0....1..1..2..0..1..2