OFFSET
1,2
COMMENTS
Column 7 of A217510
EXAMPLE
Some solutions for n=4
.....0........0........1........2........0........2........2........1
....1.0......0.4......1.0......1.0......0.2......0.0......2.2......0.2
...0.7.0....0.1.2....1.5.0....2.2.0....2.0.1....2.3.0....1.0.0....1.2.0
..0.1.0.1..1.0.2.0..1.0.0.1..0.0.3.0..1.1.0.3..0.0.3.0..0.2.0.1..1.0.0.3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 05 2012
STATUS
approved