OFFSET
1,3
COMMENTS
Column 3 of A217232
EXAMPLE
Some solutions for n=4
.....0........0........0........1........0........0........0........1
....2.0......0.2......0.1......1.1......2.1......1.1......2.2......0.1
...1.1.2....2.1.1....0.3.2....2.0.1....0.3.1....1.1.2....1.1.1....1.2.1
..0.0.3.1..0.1.3.0..0.2.2.0..0.2.2.0..0.2.0.1..0.1.2.1..0.2.0.1..1.0.2.1
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
R. H. Hardin Sep 28 2012
STATUS
approved