OFFSET
1,3
COMMENTS
Diagonal of A222635
EXAMPLE
All solutions for n=3
..0..0..1....0..0..0....0..0..0....0..1..1....0..0..0
..0..0..0....0..0..0....0..0..0....1..1..1....0..0..0
..0..0..0....1..0..0....0..0..0....1..1..1....0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 26 2013
STATUS
approved