OFFSET
1,1
COMMENTS
Column 3 of A214540
EXAMPLE
Some solutions for n=4
.....2........1........1........2........2........1........1........2
....2.2......1.1......1.1......1.3......2.2......1.1......0.2......2.2
...1.3.2....1.2.0....1.1.1....2.1.3....1.3.2....2.1.0....1.0.2....1.2.3
..3.0.3.2..1.2.1.0..2.1.1.0..3.0.2.3..0.3.3.2..0.3.0.1..2.0.0.2..2.0.3.3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 20 2012
STATUS
approved