OFFSET
1,3
COMMENTS
Column 2 of A199237
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..94
EXAMPLE
Some solutions for n=4
..0..0....0..1....0..1....0..1....0..0....0..0....0..0....0..0....0..0....0..0
..0..1....0..1....0..1....0..1....1..0....1..1....0..1....1..2....1..0....0..1
..1..1....0..1....0..2....2..1....1..2....2..1....2..1....1..2....1..1....2..1
..2..2....2..2....2..2....2..2....1..2....2..2....2..1....1..2....2..2....2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 04 2011
STATUS
approved