OFFSET
1,3
COMMENTS
Row 4 of A221388
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..21
EXAMPLE
Some solutions for n=3
..0..2..1....0..2..1....0..2..1....0..2..1....0..2..0....0..2..1....0..2..0
..0..2..1....0..2..1....0..2..0....1..2..1....1..2..1....1..2..1....1..2..1
..1..2..1....1..2..0....1..2..1....0..2..1....1..2..1....0..2..0....0..2..1
..0..2..0....1..2..0....1..2..0....0..2..0....0..2..0....1..2..0....1..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 14 2013
STATUS
approved