OFFSET
1,3
COMMENTS
Column 3 of A195522
EXAMPLE
Some solutions for n=4
..0........0........0........0........0........0........0........0
.-1.1......0.0......2-2......0.0.....-3.3.....-2.2.....-2.2......2-2
.-2-1.3....2-2.0....1.0-1....3.0-3....3-3.0....0-3.3....0-3.3....0.1-1
..3.0-3.0.-2.2.0.0.-3.2.1.0.-3.0.3.0..0.0.0.0..2.1-3.0..2.1-3.0.-2.1.1.0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 20 2011
STATUS
approved