A206413 Number of (n+1) X 8 0..2 arrays with every 2 X 3 or 3 X 2 subblock having an equal number of clockwise and counterclockwise edge increases.

3818649, 2505335985, 1701726564411, 1170258128101905, 808953988411331487, 560493388205613135219, 388756746462491144596125, 269773510833311684838942831, 187249435580728308774605385177

Offset

1,1

Comments

Column 7 of A206414.

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

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

Crossrefs

Sequence in context: A209516 A159825 A185533 * A253869 A253876 A253542

Adjacent sequences: A206410 A206411 A206412 * A206414 A206415 A206416

Keyword

nonn

Author

R. H. Hardin, Feb 07 2012

Status

approved