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