OFFSET
1,4
COMMENTS
Column 5 of A215401.
EXAMPLE
Some solutions for n=6:
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....1....1....1....1....1....1....1....1....1....1....1....1....1
..2....2....2....2....2....2....2....2....2....2....2....2....2....2....0....2
..1....0....0....0....3....3....3....0....1....3....3....3....1....3....2....1
..3....3....2....1....2....1....1....2....0....4....2....4....3....4....3....0
..2....4....3....3....1....4....2....1....3....5....4....1....1....3....2....2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 09 2012
STATUS
approved