OFFSET
1,1
COMMENTS
Diagonal of A223227
EXAMPLE
Some solutions for n=3
..1..0..1....1..0..1....0..0..0....1..0..1....0..0..1....1..0..0....1..1..1
..1..0..0....0..0..1....0..0..0....1..0..0....0..0..0....0..0..0....1..0..0
..1..0..0....0..0..1....0..0..1....1..0..1....1..0..1....1..1..1....1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 18 2013
STATUS
approved