OFFSET
1,1
COMMENTS
Column 1 of A187670
EXAMPLE
Some solutions for 4X4
..1..0..1..0....0..1..1..1....0..1..0..1....1..1..1..0....1..1..1..1
..1..1..1..1....1..1..0..1....1..1..1..0....0..1..0..1....1..0..1..0
..1..0..1..0....1..0..1..1....0..1..0..1....1..0..1..0....0..1..0..1
..0..1..0..1....0..1..1..0....1..1..1..0....1..1..0..1....1..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 12 2011
STATUS
approved