OFFSET
1,2
COMMENTS
Column 3 of A217510
EXAMPLE
Some solutions for n=4
.....0........0........2........0........0........0........2........1
....2.3......2.0......0.0......1.1......0.3......0.1......2.0......3.0
...2.0.2....0.2.0....3.1.0....2.0.2....1.3.3....0.1.2....2.0.0....1.0.2
..0.0.1.0..2.0.2.2..2.1.0.1..1.3.0.0..0.0.0.0..3.2.1.0..0.2.1.1..1.2.0.0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 05 2012
STATUS
approved