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