A206750 Number of (n+1) X 7 0..3 arrays with every 2 X 3 or 3 X 2 subblock having an equal number of clockwise and counterclockwise edge increases.

12105120, 9604042208, 7932406245672, 6623662914493232, 5553852508380267184, 4664832957577714246616, 3920972890172486310882016, 3296755941481489235686937392

Offset

1,1

Comments

Column 6 of A206752.

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A346359 A233634 A022227 * A178056 A132291 A263391

Adjacent sequences: A206747 A206748 A206749 * A206751 A206752 A206753

Keyword

nonn

Author

R. H. Hardin, Feb 12 2012

Status

approved