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.

256, 25512, 5550256, 2938041784, 4762415402596

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