OFFSET
1,2
COMMENTS
Diagonal of A221483
EXAMPLE
Some solutions for n=3
..0..2..0....0..2..1....0..3..0....0..2..1....1..2..0....0..3..0....0..3..1
..1..2..2....1..1..1....2..1..1....1..2..1....1..1..1....1..1..2....1..0..1
..0..2..0....0..3..0....0..2..0....0..2..0....0..3..0....0..2..0....0..3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 17 2013
STATUS
approved