A183824 1/256 the number of (n+1)X6 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.

50625, 128578815, 323115202755, 814479338538099, 2051388696859571241, 5167876666358771202411, 13018181193595377140956551

Offset: 1

Author

R. H. Hardin Jan 07 2011

Keywords

• nonn

Comments

Column 5 of A183827

Examples

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