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A205948 Number of (n+1) X (n+1) 0..3 arrays with no 2 X 2 subblock having the same number of clockwise edge increases as its horizontal neighbors or the same number of counterclockwise edge increases as its vertical neighbors. 0
256, 25512, 5550256, 2938041784, 4762415402596 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A205954.

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=4:

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

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

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

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

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

CROSSREFS

Sequence in context: A017116 A206055 A237134 * A309827 A205019 A017212

Adjacent sequences:  A205945 A205946 A205947 * A205949 A205950 A205951

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 02 2012

STATUS

approved

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Last modified January 16 13:05 EST 2022. Contains 350376 sequences. (Running on oeis4.)