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