OFFSET
1,2
COMMENTS
Diagonal of A231227
EXAMPLE
Some solutions for n=4
..0..0..0..0..0..0....0..0..0..1..1..1....0..0..0..0..1..1....0..0..0..1..1..1
..0..0..1..1..0..0....0..0..0..1..1..1....0..0..0..0..1..1....0..0..0..1..1..1
..1..1..1..1..1..1....1..1..1..0..0..0....0..0..0..0..1..1....0..0..1..1..1..1
..1..1..1..1..1..1....1..1..1..0..0..0....0..0..0..0..1..1....1..1..1..1..1..1
..2..2..2..2..2..2....0..0..0..1..1..1....0..0..0..0..1..1....1..1..1..1..1..1
..2..2..2..2..2..2....0..0..0..1..1..1....0..0..0..0..1..1....1..1..1..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 05 2013
STATUS
approved