A206683 Number of (n+1) X 7 0..2 arrays with every 2 X 3 or 3 X 2 subblock having an unequal number of clockwise and counterclockwise edge increases.

93696, 1809324, 41876592, 965476188, 22293930744, 514286765952, 11814420790656, 271625729217060, 6242906689405200, 143498728805999472, 3298292292638564196, 75816561136802863356, 1742726437095710308428

Offset

1,1

Comments

Column 6 of A206685.

Links

R. H. Hardin, Table of n, a(n) for n = 1..124

Example

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

Crossrefs

Sequence in context: A237682 A023945 A203784 * A234215 A200216 A126708

Adjacent sequences: A206680 A206681 A206682 * A206684 A206685 A206686

Keyword

nonn

Author

R. H. Hardin, Feb 11 2012

Status

approved