OFFSET
1,1
EXAMPLE
Some solutions for n=4
..3..1..0..2....1..0..1..2....0..0..0..3....0..2..2..0....2..1..1..2
..0..2..3..2....1..1..2..1....2..1..1..0....3..1..0..1....0..1..3..3
..1..2..2..3....1..1..3..1....0..2..1..2....1..1..1..3....1..2..3..2
..2..2..3..2....1..3..0..3....1..1..3..1....0..1..3..3....3..3..1..2
CROSSREFS
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Dec 25 2011
STATUS
approved