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