OFFSET
1,3
COMMENTS
Column 5 of A271437.
EXAMPLE
Some solutions for n=4
.....0........0........0........0........0........0........0........0
....1.0......0.1......1.1......0.0......1.2......1.1......1.0......1.0
...2.1.3....0.1.0....2.1.3....1.2.0....2.2.1....2.1.0....1.0.2....0.0.0
..2.1.1.1..2.1.0.0..1.2.3.1..1.2.0.2..3.2.1.4..1.2.0.1..1.1.2.0..2.3.3.0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 07 2016
STATUS
approved