OFFSET
1,3
COMMENTS
Column 3 of A271075.
EXAMPLE
Some solutions for n=4
.....0........0........0........0........0........0........0........0
....0.1......0.1......1.2......1.2......0.1......1.0......1.1......1.2
...2.2.1....1.2.1....0.3.3....1.1.1....0.0.2....2.1.1....0.1.0....2.2.2
..1.3.1.1..3.2.2.2..0.0.1.3..2.0.2.3..2.3.0.2..1.3.1.2..0.1.2.2..1.0.1.1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 29 2016
STATUS
approved