A209912 Half the number of (n+1) X 8 0..3 arrays with every 2 X 2 subblock having two or four distinct clockwise edge differences.

31926146, 78298719958, 174099838817590, 395928291655518846, 896278100477366851795, 2032217168415654090395276, 4605826850905941430535864352, 10440431207754050038448850990818

Offset

1,1

Comments

Column 7 of A209913.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Cf. A209913.

Sequence in context: A052097 A252356 A153752 * A290264 A206043 A157080

Adjacent sequences: A209909 A209910 A209911 * A209913 A209914 A209915

Keyword

nonn

Author

R. H. Hardin Mar 15 2012

Status

approved