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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
OFFSET
1,1
COMMENTS
Diagonal of A205954.
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 02 2012
STATUS
approved