OFFSET
1,1
COMMENTS
Diagonal of A201072.
EXAMPLE
Some solutions for n=4
..0..0..2..2....0..1..1..1....0..0..3..3....0..1..1..3....0..0..3..3
..1..1..4..4....0..2..2..4....0..2..3..4....0..2..4..6....0..2..4..4
..1..3..5..6....3..3..4..5....1..2..5..6....1..2..4..6....1..2..5..6
..3..5..5..6....5..6..6..6....1..4..5..6....3..5..5..6....1..3..5..6
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 26 2011
STATUS
approved