OFFSET
1,3
EXAMPLE
Some solutions for n=5 with a(1,1)=0:
..0..0..1..1..1....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0
..0..0..0..1..1....0..1..1..1..0....0..0..0..1..1....0..1..1..0..0
..1..0..0..0..0....0..1..1..1..1....0..0..1..1..1....0..1..1..1..1
..1..1..0..0..0....0..1..1..1..1....0..1..1..1..1....0..0..1..1..1
..1..1..0..0..0....0..0..1..1..1....0..1..1..1..1....0..0..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 16 2011
STATUS
approved