A207791 Number of (n+1) X (n+1) 0..3 arrays with every 2 X 3 or 3 X 2 subblock having an unequal number of clockwise and counterclockwise edge increases.

256, 37408, 22773384, 51169273632, 507960770486000

Offset

1,1

Comments

Diagonal of A207799.

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A221091 A205458 A206744 * A018798 A017320 A187455

Adjacent sequences: A207788 A207789 A207790 * A207792 A207793 A207794

Keyword

nonn

Author

R. H. Hardin, Feb 20 2012

Status

approved