OFFSET
1,2
COMMENTS
Column 4 of A221308
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..39
EXAMPLE
Some solutions for n=3
..0..2..2..0....0..0..0..2....2..0..0..0....0..2..0..2....0..0..2..0
..2..0..2..2....2..2..2..2....2..2..2..0....2..0..0..2....2..2..2..0
..0..2..0..0....0..0..0..2....2..0..2..0....0..2..2..0....2..0..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 09 2013
STATUS
approved