A208491 Number of (n+1) X 8 0..3 arrays with the number of clockwise edge increases in every 2 X 2 subblock equal to the number of counterclockwise edge increases:

113880744, 222232271912, 449271828443912, 920635760474340792, 1897470416545860341536, 3920972889443714995894776, 8112174131718066295245481744, 16792956299828228584347524939848

Offset

1,1

Comments

Column 7 of A208492.

Links

R. H. Hardin, Table of n, a(n) for n = 1..161

Example

Some solutions for n=4:
..0..3..1..2..1..1..1..2....0..0..3..0..1..1..2..0....2..0..3..2..0..2..3..2
..2..0..2..2..1..3..3..0....2..2..1..2..3..3..0..0....3..1..0..3..2..0..1..3
..0..1..3..3..2..0..3..3....2..3..2..0..1..3..3..3....0..3..2..0..3..1..1..1
..3..0..1..3..2..2..0..3....3..1..3..1..3..3..3..1....0..3..2..0..3..3..1..2
..0..2..3..2..3..3..1..0....3..1..3..3..3..1..1..1....1..0..3..1..0..3..3..0

Crossrefs

Sequence in context: A147581 A281448 A171571 * A205169 A112018 A216010

Adjacent sequences: A208488 A208489 A208490 * A208492 A208493 A208494

Keyword

nonn

Author

R. H. Hardin, Feb 27 2012

Status

approved