OFFSET
1,1
COMMENTS
Column 2 of A213990
EXAMPLE
Some solutions for n=3
..0..1..1....1..0..1....0..2..0....0..1..0....1..1..2....0..0..0....0..1..2
..0..0..2....0..0..2....0..0..0....0..1..2....0..0..0....0..0..0....1..0..0
..0..0..0....0..1..0....0..0..0....0..0..0....0..0..0....0..0..0....0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 30 2012
STATUS
approved