A206275 Number of (n+1) X 7 0..2 arrays with no 2 X 2 subblock having the number of clockwise edge increases equal to the number of counterclockwise edge increases in its adjacent leftward or upward neighbors.

77580, 123357, 437340, 1824315, 8405508, 39044748, 167821686, 751671621, 3186738756, 14344492080, 63040672158, 293272589487, 1300384478688, 6029134019499, 26776062237576, 124337331861300, 551531622746376

Offset

1,1

Comments

Column 6 of A206277.

Links

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

Example

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

Crossrefs

Sequence in context: A124489 A215662 A183694 * A249958 A232349 A157732

Adjacent sequences: A206272 A206273 A206274 * A206276 A206277 A206278

Keyword

nonn

Author

R. H. Hardin, Feb 05 2012

Status

approved