OFFSET
1,2
COMMENTS
Diagonal of A201989
EXAMPLE
Some solutions for n=3
.-3.-3..1...-3.-1..0...-3..1..3...-3.-3..1...-3.-1..2...-3..0..2...-1.-1..0
..2..2.-2....0.-1..2...-3..2..0...-3..2..3...-1..1..0...-1..2.-2...-1..2.-3
..2..3.-2....2.-1..2...-2.-1..3...-2..2..3....3.-2..1....1.-1..2....2..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 07 2011
STATUS
approved