OFFSET
1,2
COMMENTS
Diagonal of A208825.
EXAMPLE
All solutions for n=3:
.-2....0...-3...-3...-2...-1...-2...-1
.-1....0....0....1....0...-1....1....0
..3....0....3....2....2....2....1....1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 01 2012
STATUS
approved