OFFSET
1,2
COMMENTS
Diagonal of A183442
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..15
EXAMPLE
Some solutions for 3X3
..0..1..0....0..0..0....1..1..0....0..1..0....0..1..1....0..0..1....1..0..0
..1..0..0....1..0..0....0..0..0....0..1..0....0..0..0....0..0..1....0..1..0
..0..0..0....0..1..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2011
STATUS
approved