OFFSET
1,1
COMMENTS
Diagonal of A184457.
EXAMPLE
Some solutions with a(1,1)=0 for 4 X 4
..0..0..0..0....0..1..1..0....0..0..2..0....0..1..0..0....0..1..2..0
..0..0..1..0....2..1..2..2....0..1..2..0....0..0..2..0....1..0..0..2
..1..2..2..1....1..1..0..1....0..0..1..0....1..2..0..1....2..0..0..1
..1..1..1..1....0..1..1..0....0..0..2..0....0..1..0..0....2..0..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 14 2011
STATUS
approved