OFFSET
1,2
COMMENTS
Column 2 of A199230
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..153
EXAMPLE
Some solutions for n=4
..0..1....0..1....0..0....0..1....0..1....0..0....0..1....0..1....0..1....0..1
..1..2....0..1....1..2....0..1....2..0....1..1....2..0....0..2....2..0....2..2
..2..0....2..2....0..1....1..2....2..1....2..0....0..1....1..0....1..2....0..1
..1..0....1..0....2..2....0..2....0..1....2..1....2..1....1..2....0..2....2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 04 2011
STATUS
approved