OFFSET
1,1
COMMENTS
Column 1 of A261761.
EXAMPLE
Some solutions for n=4
..1..0....1..0....1..1....1..1....1..0....1..0....1..0....1..0....1..1....1..1
..1..0....1..0....1..0....1..0....1..1....1..0....1..1....1..0....1..1....1..1
..1..1....1..0....1..0....1..1....1..1....1..1....1..0....1..0....1..1....1..1
..1..0....1..1....1..1....1..1....1..0....1..1....1..1....1..1....1..1....1..0
..1..1....1..0....1..1....1..1....1..1....1..1....1..1....1..1....1..1....1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 31 2015
STATUS
approved