OFFSET
1,1
COMMENTS
Diagonal of A187317.
EXAMPLE
Some solutions for 4 X 4 with a(1,1)=0:
..0..1..1..0....0..1..0..1....0..1..1..1....0..0..0..1....0..0..1..0
..1..0..0..1....0..0..0..1....1..0..0..0....0..1..0..0....0..0..1..1
..1..1..0..1....1..0..1..0....1..1..1..0....1..0..1..0....1..1..0..0
..1..1..1..0....1..0..0..1....1..1..0..0....0..0..1..1....0..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 08 2011
STATUS
approved