OFFSET
1,2
COMMENTS
Diagonal of A183456.
EXAMPLE
Some solutions for 5X5
..1..1..0..1..1....0..0..0..0..0....1..1..0..0..0....0..0..0..1..1
..1..1..0..1..1....1..1..0..0..0....1..1..0..1..1....0..0..0..1..1
..0..0..0..0..0....1..1..0..0..0....0..0..0..1..1....0..0..0..0..0
..0..1..1..0..0....0..0..0..1..1....0..0..0..0..0....0..1..1..0..0
..0..1..1..0..0....0..0..0..1..1....0..0..0..0..0....0..1..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 05 2011
STATUS
approved