OFFSET
1,1
COMMENTS
Column 5 of A215904
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..24
EXAMPLE
Some solutions for n=3
..0..x..1..x..2....0..x..1..x..2....0..x..1..x..1....0..x..1..x..2
..x..3..x..3..x....x..3..x..4..x....x..2..x..2..x....x..3..x..4..x
..2..x..2..x..2....5..x..6..x..5....3..x..4..x..3....0..x..2..x..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 26 2012
STATUS
approved