OFFSET
1,1
EXAMPLE
Some solutions for n=3
..2..0..2..1....2..1..1..2....3..1..2..0....2..0..1..2....1..0..3..0
..0..1..3..1....1..0..3..0....1..0..1..1....0..3..2..3....0..3..1..0
..2..3..2..1....1..3..1..3....2..1..3..2....1..2..1..0....3..1..2..2
..1..1..1..0....2..0..3..2....0..1..2..0....2..3..0..3....0..0..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 31 2012
STATUS
approved