A183822 1/256 the number of (n+1)X4 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.

225, 43947, 8538066, 1661285961, 323115202755, 62851591581012, 12225396762980829, 2378005715920214025, 462553489019014423650, 89972804578123532061801, 17500904466916598194011543

Offset: 1

Author

R. H. Hardin Jan 07 2011

Keywords

• nonn

Comments

Column 3 of A183827

Examples

			Some solutions with upper left block zero for 3X4
..0..0..2..1....0..0..2..3....0..0..3..3....0..0..2..0....0..0..3..0
..0..0..0..0....0..0..3..2....0..0..3..0....0..0..1..3....0..0..3..2
..2..3..1..0....3..1..0..1....2..1..2..3....3..3..2..2....0..3..0..3