OFFSET
1,1
COMMENTS
Column 2 of A214540
EXAMPLE
Some solutions for n=4
.....1........1........1........1........1........1........1........1
....1.1......2.0......2.0......0.2......1.1......0.2......0.2......1.1
...2.0.1....2.0.1....1.2.0....0.2.1....2.0.1....1.0.2....1.0.2....2.0.1
..1.2.0.1..1.2.0.1..1.2.0.1..0.2.1.1..0.2.0.2..0.2.0.2..1.0.1.2..2.0.1.1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 20 2012
STATUS
approved