A206677 Number of (n+1) X (n+1) 0..2 arrays with every 2 X 3 or 3 X 2 subblock having an unequal number of clockwise and counterclockwise edge increases.

81, 1728, 89022, 7423464, 1533200232, 514286765952, 430502655386142, 585855616489964136, 1994442621051565402650

Offset

1,1

Comments

Diagonal of A206685.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A065791 A237503 A268974 * A237091 A253306 A237801

Adjacent sequences: A206674 A206675 A206676 * A206678 A206679 A206680

Keyword

nonn

Author

R. H. Hardin, Feb 11 2012

Status

approved