OFFSET
1,2
COMMENTS
Diagonal of A267667.
EXAMPLE
Some solutions for n=5
..0..0..1..0..1....0..0..1..0..1....0..1..0..1..1....0..0..1..1..0
..0..1..0..0..1....1..0..1..0..1....1..1..0..0..1....1..1..0..0..1
..0..1..0..1..1....0..0..1..0..1....0..0..1..0..1....1..0..1..1..0
..1..0..1..0..0....1..0..1..0..1....0..1..0..0..1....1..0..1..0..1
..0..1..0..1..1....1..0..0..1..1....0..1..0..1..1....0..1..0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 19 2016
STATUS
approved