OFFSET
1,2
COMMENTS
Column 2 of A271034.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..30
EXAMPLE
Some solutions for n=4
.....0........1........0........0........1........2........0........0
....0.0......1.1......0.1......0.0......1.1......2.2......1.2......0.2
...0.0.0....1.1.2....1.1.1....2.0.1....0.1.1....0.2.2....2.2.2....0.2.2
..0.2.2.1..0.2.2.2..0.1.1.1..2.2.2.2..0.1.1.1..0.2.2.2..0.2.2.2..0.1.2.2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 29 2016
STATUS
approved