OFFSET
1,2
COMMENTS
Diagonal of A222690
EXAMPLE
Some solutions for n=3
..0..0..0....0..0..0....0..0..0....0..0..1....0..1..0....0..0..1....0..1..2
..0..0..0....0..0..1....0..0..0....0..1..1....1..1..1....1..0..0....1..1..1
..1..2..2....2..1..1....1..0..2....1..1..1....1..1..1....0..0..0....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 28 2013
STATUS
approved