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A208484
Number of (n+1) X (n+1) 0..3 arrays with the number of clockwise edge increases in every 2 X 2 subblock equal to the number of counterclockwise edge increases.
0
152, 33416, 43689232, 343092183768, 16261866249456960, 4664832940178290442768, 8112174131718066295245481744, 85615997981426512072932676873435656
OFFSET
1,1
COMMENTS
Diagonal of A208492.
EXAMPLE
Some solutions for n=4:
..1..0..3..2..1....3..1..0..0..1....1..2..0..2..2....1..0..2..0..1
..2..1..0..3..2....1..1..1..0..0....1..1..3..0..2....2..1..3..1..0
..2..2..1..0..3....3..1..3..1..0....0..0..1..3..0....1..3..2..3..1
..3..2..1..1..0....0..3..3..3..2....1..0..0..2..3....2..0..3..1..0
..1..3..2..1..0....1..0..3..0..3....1..1..1..3..3....1..2..0..2..1
CROSSREFS
Sequence in context: A229418 A035823 A265861 * A335091 A323319 A157881
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 27 2012
STATUS
approved