OFFSET
1,1
COMMENTS
Column 4 of A222894
EXAMPLE
Some solutions for n=3
..0..1..2..3....0..1..1..2....0..1..1..2....0..1..2..2....0..1..2..3
..3..4..4..5....3..3..4..4....3..4..5..5....3..1..4..3....4..1..5..6
..2..2..1..1....1..5..5..1....5..2..6..7....4..2..0..3....7..6..4..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 08 2013
STATUS
approved