OFFSET
1,1
COMMENTS
Diagonal of A219173
EXAMPLE
Some solutions for n=3
..0..0..0....1..1..1....0..0..0....0..0..0....0..0..1....0..0..1....1..1..2
..0..0..0....1..0..2....0..0..2....0..0..0....0..1..1....0..0..0....1..0..1
..1..2..0....0..0..0....0..1..2....1..0..0....2..1..1....0..0..0....0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 13 2012
STATUS
approved