OFFSET
1,1
COMMENTS
Column 2 of A216937.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..43
EXAMPLE
Some solutions for n=3:
......0.0.0..........0.0.1..........0.0.0..........0.0.1..........0.0.0
.....0.0.0.1........0.1.1.1........0.0.0.0........0.0.1.1........0.1.1.2
....0.0.0.1.2......0.1.1.2.2......0.0.0.0.1......0.1.1.1.2......1.1.1.2.2
.....1.1.1.2........2.2.2.2........0.0.0.2........1.1.2.2........1.1.2.2
......2.2.2..........2.2.2..........0.0.2..........2.2.2..........1.2.2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 20 2012
STATUS
approved