A206019 Number of (n+1) X 7 0..3 arrays with the number of clockwise edge increases in every 2 X 2 subblock unequal to the number of counterclockwise edge increases.

1237000, 129573608, 14856355384, 1777528400280, 216074701653640, 26463715503890184, 3251307042119435624, 400041879843666759720, 49252957039545221475992, 6065827545082816605106648

Offset

1,1

Comments

Column 6 of A206021.

Links

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

Example

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

Crossrefs

Sequence in context: A144694 A156113 A118900 * A210084 A212489 A290250

Adjacent sequences: A206016 A206017 A206018 * A206020 A206021 A206022

Keyword

nonn

Author

R. H. Hardin, Feb 02 2012

Status

approved