OFFSET
1,2
COMMENTS
Column 4 of A181039
EXAMPLE
Some solutions for 6X4
..1..1..1..1....1..1..1..1....1..1..1..1....1..1..1..1....1..1..1..1
..1..0..0..0....1..0..0..1....1..0..1..0....1..0..0..1....1..0..0..0
..1..1..1..1....1..0..0..1....1..0..1..1....1..0..0..1....1..1..1..0
..1..0..1..0....1..0..1..0....1..1..1..1....1..1..1..1....1..1..1..0
..1..0..1..0....1..0..1..1....1..1..1..0....1..1..1..1....1..0..1..1
..1..1..1..0....1..0..1..0....1..1..1..0....1..0..0..0....1..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 30 2010
STATUS
approved