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A206677 Number of (n+1) X (n+1) 0..2 arrays with every 2 X 3 or 3 X 2 subblock having an unequal number of clockwise and counterclockwise edge increases. 0
81, 1728, 89022, 7423464, 1533200232, 514286765952, 430502655386142, 585855616489964136, 1994442621051565402650 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206685.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=4:

..1..2..2..2..1....2..1..2..1..2....2..2..2..0..1....0..0..1..0..2

..2..1..0..2..0....0..1..2..0..1....0..0..1..2..2....2..2..1..1..2

..2..0..1..1..2....0..0..0..0..2....2..1..0..2..1....0..1..2..0..1

..1..2..1..0..2....1..2..2..1..0....2..1..2..0..1....1..1..0..2..2

..0..2..1..2..1....1..1..0..2..2....2..0..1..1..2....2..0..0..1..1

CROSSREFS

Sequence in context: A065791 A237503 A268974 * A237091 A253306 A237801

Adjacent sequences:  A206674 A206675 A206676 * A206678 A206679 A206680

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 11 2012

STATUS

approved

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Last modified August 9 15:33 EDT 2022. Contains 356026 sequences. (Running on oeis4.)