OFFSET
1,1
COMMENTS
Diagonal of A220153
EXAMPLE
Some solutions for n=3
..0..0..1....1..0..0....0..0..0....0..0..0....0..0..1....0..0..0....2..1..1
..0..0..0....1..0..0....1..0..0....0..0..0....0..0..0....1..1..0....2..1..1
..2..2..0....2..1..1....1..0..0....2..2..0....1..1..0....2..1..2....2..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 06 2012
STATUS
approved