OFFSET
1,3
COMMENTS
Column 3 of A271246.
EXAMPLE
Some solutions for n=4
.....0........0........0........0........0........0........0........0
....1.2......0.1......1.1......1.2......1.0......1.1......0.1......0.1
...3.0.0....2.2.0....1.2.2....3.3.3....2.3.2....1.2.0....2.2.3....1.2.2
..0.0.1.2..0.0.0.1..2.3.3.0..3.2.3.2..2.2.3.0..3.2.1.3..2.2.3.3..1.2.0.3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 02 2016
STATUS
approved