OFFSET
1,2
COMMENTS
Column 2 of A222906
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
Some solutions for n=3
..0..0....0..0....0..1....0..0....0..1....0..0....0..0....0..1....0..0....0..0
..1..2....0..0....1..1....0..1....0..0....0..1....0..0....2..2....1..0....0..0
..2..2....0..0....1..1....0..0....0..0....1..1....1..2....2..2....0..0....1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 09 2013
STATUS
approved