OFFSET
1,2
COMMENTS
Column 3 of A221817
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..41
EXAMPLE
Some solutions for n=3
..1..1..1....0..1..1....0..1..1....0..2..1....0..2..1....0..1..1....1..1..1
..0..2..0....0..2..1....1..2..0....0..2..1....1..3..0....1..3..0....0..3..0
..1..3..0....1..3..0....1..3..0....1..2..0....1..1..0....1..2..0....1..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 26 2013
STATUS
approved