OFFSET
1,2
COMMENTS
Diagonal of A221255
EXAMPLE
Some solutions for n=3
..0..2..0....1..2..0....0..2..0....1..2..0....0..2..1....1..2..1....0..2..1
..2..2..0....1..2..0....1..2..0....0..2..1....1..2..0....0..2..0....1..2..1
..1..2..0....1..2..0....2..2..0....1..2..0....1..2..0....0..2..1....0..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 06 2013
STATUS
approved