OFFSET
1,3
COMMENTS
Column 6 of A271339.
EXAMPLE
Some solutions for n=4
.....0........0........0........0........0........0........0........0
....0.0......1.2......0.0......1.2......1.0......0.1......0.0......1.0
...1.2.0....1.1.3....1.1.1....3.1.1....1.1.1....1.2.3....1.2.2....1.0.0
..3.0.0.3..4.0.0.2..2.0.0.2..1.1.1.3..2.2.3.4..2.2.3.3..3.0.3.4..0.0.1.1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 04 2016
STATUS
approved