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