OFFSET
1,1
COMMENTS
Diagonal of A223440
EXAMPLE
Some solutions for n=3
..6..7.15...15.13.11....4..5..6....3..4..5....4.12..4...10..8.10...15.13.11
..7..0..7...13.15..9....5..6..7....4..5..4....5..4..5...12.10..8...13.11.13
..6..7..0...15..9.11....6..7..6....5..6..5....4..5.13....4.12.14...15..9.15
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 20 2013
STATUS
approved