A208489 Number of (n+1) X 6 0..3 arrays with the number of clockwise edge increases in every 2 X 2 subblock equal to the number of counterclockwise edge increases.

1253608, 414522184, 140051200968, 47661128330328, 16261866249456960, 5553852092522802280, 1897470416545860341536, 648358115644067172499256, 221552861024287017431767352, 75709141973276719446226452336

Offset

1,1

Comments

Column 5 of A208492.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A251118 A126174 A186089 * A257268 A233465 A250596

Adjacent sequences: A208486 A208487 A208488 * A208490 A208491 A208492

Keyword

nonn

Author

R. H. Hardin, Feb 27 2012

Status

approved