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A206129
Number of (n+1) X (n+1) 0..3 arrays with every 2 X 3 or 3 X 2 subblock having exactly three counterclockwise and three clockwise edge increases.
0
256, 6668, 2761756, 5465582068, 51845281856116, 2363085244017636372, 518342328616619031217028, 547728179121316322465056282220
OFFSET
1,1
COMMENTS
Diagonal of A206137.
EXAMPLE
Some solutions for n=4:
..1..2..3..1..2....0..1..2..1..2....2..1..2..3..0....3..1..3..2..3
..2..3..1..2..0....1..2..0..2..1....0..2..0..1..2....0..2..0..3..2
..1..2..3..0..2....0..1..2..1..3....1..3..2..3..0....1..3..1..0..3
..0..1..2..3..0....2..3..0..2..0....3..2..0..1..2....2..0..2..1..0
..3..0..1..2..3....1..2..3..1..2....1..3..1..2..1....3..1..3..2..1
CROSSREFS
Sequence in context: A056585 A321818 A231307 * A236214 A232959 A187955
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 04 2012
STATUS
approved