OFFSET
1,2
COMMENTS
Column 3 of A270509.
EXAMPLE
Some solutions for n=4
.....3........1........0........0........0........2........0........0
....0.3......2.0......1.1......2.1......1.1......0.2......0.0......0.0
...0.2.1....0.1.0....2.0.2....0.1.0....0.1.2....1.0.1....3.3.3....3.2.1
..1.1.1.1..2.0.3.2..0.3.3.1..3.1.0.2..0.0.3.3..0.0.0.2..3.2.2.0..3.0.0.3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 18 2016
STATUS
approved