OFFSET
1,2
COMMENTS
Diagonal of A186902
EXAMPLE
Some solutions for 3X3
..0..0..0....1..0..1....0..1..1....0..0..1....0..0..1....0..1..0....0..0..0
..1..0..0....1..0..0....0..0..0....0..0..1....1..0..0....1..1..0....1..0..0
..0..0..0....1..0..1....1..1..1....0..0..1....1..0..0....1..0..0....1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 28 2011
STATUS
approved