OFFSET
1,1
COMMENTS
Column 5 of A216338.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..49
EXAMPLE
Some solutions for n=4
..0..x..1..x..2....0..x..1..x..2....0..x..1..x..2....0..x..1..x..0
..x..3..x..4..x....x..3..x..1..x....x..3..x..0..x....x..2..x..3..x
..1..x..5..x..3....2..x..0..x..3....1..x..4..x..5....4..x..1..x..0
..x..4..x..0..x....x..2..x..0..x....x..6..x..7..x....x..0..x..4..x
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 04 2012
STATUS
approved