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A209708
1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having distinct clockwise edge differences
0
24, 2710, 1277340, 2744311427, 26024000948100, 1105092894348108870, 208427296314737259382008, 175434641568425738606430293927
OFFSET
1,1
COMMENTS
Diagonal of A209716
EXAMPLE
Some solutions for n=4
..0..2..0..1..2....1..0..3..3..0....3..3..2..3..0....0..2..1..1..0
..1..3..0..3..1....1..3..1..0..2....0..1..3..0..2....2..1..3..0..2
..3..2..2..0..3....3..2..3..2..1....2..0..2..2..1....0..2..1..1..0
..2..0..3..0..1....1..0..0..0..2....1..2..3..0..2....2..1..3..0..2
..1..2..2..2..0....3..1..3..2..1....2..0..1..0..3....1..3..2..2..1
CROSSREFS
Sequence in context: A217971 A296652 A092706 * A266870 A277003 A060902
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 11 2012
STATUS
approved