OFFSET
1,3
COMMENTS
Diagonal of A222371
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..0..0..1....0..0..0..0....0..1..1..1....0..1..1..2
..0..0..0..0....0..0..0..1....0..0..0..0....0..1..1..1....2..2..2..2
..0..0..0..0....0..0..0..2....1..1..1..1....0..1..1..1....2..2..2..2
..1..1..0..1....0..0..0..1....1..1..1..1....1..1..1..1....2..2..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 17 2013
STATUS
approved