A206020 Number of (n+1) X 8 0..3 arrays with the number of clockwise edge increases in every 2 X 2 subblock unequal to the number of counterclockwise edge increases.

8079000, 1477339224, 302535915752, 65511284596104, 14510530142894840, 3251307042119435624, 732416961112609324840, 165443189675086011015528, 37421249748394203065104568, 8469999436280795373419180280

Offset

1,1

Comments

Column 7 of A206021.

Links

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

Example

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

Crossrefs

Sequence in context: A185929 A268334 A032430 * A263072 A353540 A183020

Adjacent sequences: A206017 A206018 A206019 * A206021 A206022 A206023

Keyword

nonn

Author

R. H. Hardin, Feb 02 2012

Status

approved