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A206744
Number of (n+1) X (n+1) 0..3 arrays with every 2 X 3 or 3 X 2 subblock having an equal number of clockwise and counterclockwise edge increases.
0
256, 36384, 43894936, 343128343904, 16261882009570952, 4664832957577714246616
OFFSET
1,1
COMMENTS
Diagonal of A206752.
EXAMPLE
Some solutions for n=4:
..0..0..0..0..1....2..2..3..0..3....0..0..3..0..0....1..0..0..0..0
..0..1..0..3..0....3..2..2..3..0....1..1..0..3..3....3..1..0..1..0
..2..3..1..0..0....1..3..2..3..3....3..3..1..0..3....1..3..1..3..1
..2..2..3..2..0....1..3..3..3..0....1..1..3..1..0....1..1..3..0..2
..0..0..1..3..2....3..2..2..2..3....0..1..1..2..1....0..0..1..2..0
CROSSREFS
Sequence in context: A206101 A221091 A205458 * A207791 A018798 A017320
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 12 2012
STATUS
approved