OFFSET
1,2
COMMENTS
Diagonal of A219310
EXAMPLE
Some solutions for n=3
..0..0..0....1..0..0....1..1..1....1..0..0....0..0..0....0..1..1....1..1..1
..0..0..0....0..0..1....1..1..0....1..0..0....0..0..1....0..0..1....0..0..0
..0..0..0....1..0..0....1..0..0....1..1..0....0..0..1....0..1..1....0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 17 2012
STATUS
approved