OFFSET
1,2
EXAMPLE
Some solutions for n=3
..0..1..2..3....0..1..0..3....0..1..2..3....0..1..3..2....0..1..2..1
..1..2..3..1....1..2..2..3....1..2..0..0....1..2..1..2....1..2..3..3
..2..3..0..1....0..2..2..0....2..0..1..3....3..1..3..3....2..3..0..1
..3..1..1..3....3..3..0..3....3..0..3..0....2..2..3..3....1..3..1..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 27 2012
STATUS
approved