OFFSET
1,4
COMMENTS
Column 1 of A199230
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..175
EXAMPLE
Some solutions for n=6
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....0....1....1....1....1....0....1....1....0....1....1....1
..2....2....0....1....0....1....1....2....1....0....2....1....1....2....2
..1....0....1....2....2....2....2....0....1....2....2....2....0....1....2
..2....1....2....2....1....0....2....2....2....2....0....1....2....0....1
..0....2....2....1....2....2....0....1....2....1....1....2....2....2....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 04 2011
STATUS
approved