OFFSET
1,3
COMMENTS
Diagonal of A208970.
EXAMPLE
Some solutions for n=5:
.-2...-3...-3...-1...-2...-1...-1...-2...-2...-1...-2....0...-2...-2...-3...-3
.-2...-3...-1....0...-1....0...-1...-1....0....0...-1....0....0....0...-2...-3
..1....2....1...-1....2....0....1....2....2...-1....1....0....0....1....3....1
..1....2....3....0....0....0....0....1...-1....1....2....0....1....0....3....3
..2....2....0....2....1....1....1....0....1....1....0....0....1....1...-1....2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 03 2012
STATUS
approved