OFFSET
1,2
EXAMPLE
All solutions for n=2
..1..0..1..1....1..1..0..1....1..1..0..1....1..0..1..1
..1..0..0..0....1..0..0..0....0..0..0..1....0..0..0..1
..0..0..0..1....0..0..0..1....1..0..0..0....1..0..0..0
..1..1..0..1....1..0..1..1....1..0..1..1....1..1..0..1
CROSSREFS
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Mar 17 2013
STATUS
approved