OFFSET
1,1
EXAMPLE
Some solutions for n=3
..0..1..0..2....0..0..1..0....0..1..0..1....0..1..0..1....0..0..1..0
..1..2..0..1....0..0..2..0....1..2..0..2....1..2..1..2....0..0..2..0
..0..0..1..2....1..2..1..0....0..0..1..1....0..1..0..0....1..2..1..1
..2..1..2..0....0..0..0..2....1..2..1..1....1..2..0..0....0..0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 28 2012
STATUS
approved