A183826 1/256 the number of (n+1)X8 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.

11390625, 376152548283, 12225396762980829, 399185865558804067443, 13018181193595377140956551

Offset

1,1

Comments

Column 7 of A183827

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A204790 A394402 A395548 * A323331 A072142 A043674

Adjacent sequences: A183823 A183824 A183825 * A183827 A183828 A183829

Keyword

nonn

Author

R. H. Hardin, Jan 07 2011

Status

approved