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A206181 Number of (n+1) X (n+1) 0..3 arrays with every 2 X 2 subblock having the same number of clockwise edge increases as its horizontal neighbors and the same number of counterclockwise edge increases as its vertical neighbors. 0
256, 19688, 3802676, 5674969344, 51975660472496, 2363371012699739212 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206188.

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=4:

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

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

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

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

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

CROSSREFS

Sequence in context: A206319 A216397 A090650 * A251968 A017116 A206055

Adjacent sequences:  A206178 A206179 A206180 * A206182 A206183 A206184

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 04 2012

STATUS

approved

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Last modified October 22 07:29 EDT 2019. Contains 328315 sequences. (Running on oeis4.)