A206406 Number of (n+1) X (n+1) 0..2 arrays with every 2 X 3 or 3 X 2 subblock having an equal number of clockwise and counterclockwise edge increases.

81, 5199, 2073999, 4099250889, 38883964087761, 1772313933215113017, 388756746462491144596125, 410796134340987248242931767083, 2092643007412378548348442168950591087

Offset

1,1

Comments

Diagonal of A206414.

Links

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

Example

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

Crossrefs

Sequence in context: A222166 A219728 A187454 * A238172 A260858 A237300

Adjacent sequences: A206403 A206404 A206405 * A206407 A206408 A206409

Keyword

nonn

Author

R. H. Hardin, Feb 07 2012

Status

approved