OFFSET
1,2
COMMENTS
Column 3 of A221321.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
Some solutions for n=6
..0....1....1....4....0....0....2....0....0....1....3....1....0....0....0....1
..1....0....3....0....2....1....1....2....1....0....1....0....1....1....2....0
..2....1....1....1....1....2....0....1....0....2....0....1....3....0....0....1
..0....3....0....0....0....1....2....2....2....0....1....2....1....4....2....0
..1....1....1....1....1....2....1....1....1....1....0....0....0....0....0....1
..2....0....0....0....2....0....0....0....2....2....1....2....1....1....2....3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 10 2013
STATUS
approved