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A205634 Number of (n+1)X(n+1) 0..3 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. 0
256, 28724, 8381936, 11786800328, 101664965477840, 4561749663096542724, 995980221935339574016820 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A205642.

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=4:

..0..0..2..2..3....2..0..0..0..2....3..3..1..3..1....2..1..1..2..1

..0..2..2..3..3....1..2..1..2..1....1..0..0..0..0....0..0..2..2..1

..2..2..3..3..0....3..2..0..1..0....1..2..1..3..1....3..2..2..0..0

..2..3..3..0..0....3..0..1..3..1....3..2..0..3..3....3..3..2..3..1

..2..3..0..0..2....2..3..0..1..2....3..1..0..3..0....3..0..2..0..0

CROSSREFS

Sequence in context: A205019 A017212 A181243 * A269292 A205362 A206101

Adjacent sequences:  A205631 A205632 A205633 * A205635 A205636 A205637

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 29 2012

STATUS

approved

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Last modified January 16 13:35 EST 2022. Contains 350376 sequences. (Running on oeis4.)