A206675 Number of (n+1) X 8 0..2 arrays with no 2 X 2 subblock having the same number of clockwise edge increases as its horizontal neighbors or the same number of counterclockwise edge increases as its vertical neighbors.

750426, 6474150, 70322310, 700650756, 8557823793, 108434010612, 1530071121621, 22248004177848, 342778375954590, 5376474597787368, 86682713932043619

Offset

1,1

Comments

Column 7 of A206676.

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=4:
..0..2..0..2..1..0..1..2....0..1..1..0..1..1..1..1....2..1..0..2..1..2..2..1
..0..2..1..1..2..2..1..1....1..0..0..1..1..1..0..2....1..2..2..0..0..2..0..2
..2..0..1..1..0..0..2..0....1..0..0..2..0..2..2..0....0..2..2..0..0..1..2..2
..1..0..0..2..0..0..2..1....2..2..1..1..0..1..0..0....1..0..1..2..2..1..2..2
..2..0..0..1..0..1..0..0....2..2..0..2..2..2..0..0....0..0..2..2..2..0..1..1

Crossrefs

Sequence in context: A133979 A352345 A205743 * A205519 A166001 A253374

Adjacent sequences: A206672 A206673 A206674 * A206676 A206677 A206678

Keyword

nonn

Author

R. H. Hardin, Feb 11 2012

Status

approved