A206666 Number of (n+1) X 7 0..2 arrays with every 2 X 2 subblock having the number of clockwise edge increases equal to the number of counterclockwise edge increases in its adjacent leftward and upward neighbors.

373644, 5593611, 170170494, 6593653335, 269149632948, 11143560422013, 464729380449429, 19426122492513648, 813739971207123378, 34104124057653666906, 1430366045206364340207, 59998334445467086550745

Offset

1,1

Comments

Column 6 of A206668.

Links

R. H. Hardin, Table of n, a(n) for n = 1..167

Example

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

Crossrefs

Sequence in context: A178288 A250456 A043661 * A296815 A147770 A218398

Adjacent sequences: A206663 A206664 A206665 * A206667 A206668 A206669

Keyword

nonn

Author

R. H. Hardin, Feb 11 2012

Status

approved