OFFSET
1,2
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..16
EXAMPLE
Some solutions for n=4
..1........1........1........0........1........1........0........0
..2.1......2.0......3.2......0.1......1.1......3.2......2.2......1.2
..1.2.0....3.3.2....1.3.0....2.1.2....3.2.2....2.1.1....1.1.1....1.1.1
..0.2.1.1..2.1.1.1..2.1.1.0..2.2.1.1..1.3.2.0..1.2.3.1..2.2.2.1..0.2.1.0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 25 2011
STATUS
approved