A208490 Number of (n+1) X 7 0..3 arrays with the number of clockwise edge increases in every 2 X 2 subblock equal to the number of counterclockwise edge increases.

11948296, 9597910280, 7932164084608, 6623652903138136, 5553852092522802280, 4664832940178290442768, 3920972889443714995894776, 3296755941450923874944187224, 2772285061723585066493554850800

Offset

1,1

Comments

Column 6 of A208492.

Links

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

Example

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

Crossrefs

Cf. A208492.

Sequence in context: A280983 A184651 A123086 * A272021 A345718 A346359

Adjacent sequences: A208487 A208488 A208489 * A208491 A208492 A208493

Keyword

nonn

Author

R. H. Hardin, Feb 27 2012

Status

approved