OFFSET
1,3
COMMENTS
Column 3 of A271339.
EXAMPLE
Some solutions for n=4
.....0........0........0........0........0........0........0........0
....0.0......1.0......1.2......1.2......1.2......0.1......1.0......1.0
...1.2.2....1.2.1....3.2.2....0.2.2....3.0.0....2.3.1....2.2.0....2.3.0
..3.1.1.1..3.1.1.1..2.2.0.1..2.3.3.0..1.0.0.3..1.3.1.1..1.0.0.0..2.3.3.0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 04 2016
STATUS
approved