OFFSET
1,1
COMMENTS
Diagonal of A186570.
EXAMPLE
Some solutions for 4 X 4
..0..0..5..5....0..0..0..0....4..0..0..3....4..0..0..3....4..4..3..4
..0..0..0..4....3..0..0..0....0..4..0..0....0..4..0..0....3..4..4..3
..0..0..0..0....0..3..0..0....0..0..4..0....0..0..4..0....4..3..4..4
..0..0..0..0....4..0..3..0....3..0..0..4....1..0..0..4....4..4..3..4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 23 2011
STATUS
approved