OFFSET
1,3
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..116
EXAMPLE
Some solutions for n=7
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..0....1....1....0....1....0....0....1....1....1....0....1....0....0....1....1
..1....1....0....1....0....0....0....2....2....0....1....0....1....1....0....1
..2....1....0....0....1....0....1....1....1....0....1....2....0....2....0....1
..1....0....1....1....2....0....0....0....0....1....1....2....0....2....2....1
..1....0....0....1....1....0....1....1....0....1....0....1....0....1....1....1
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 21 2011
STATUS
approved