OFFSET
1,2
COMMENTS
Column 5 of A216084.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..49
EXAMPLE
Some solutions for n=4
..x..0..x..1..x....x..0..x..1..x....x..0..x..1..x....x..0..x..1..x
..2..x..3..x..4....2..x..3..x..4....1..x..0..x..2....1..x..2..x..1
..x..5..x..2..x....x..5..x..3..x....x..2..x..3..x....x..3..x..4..x
..1..x..6..x..1....6..x..5..x..1....1..x..4..x..1....4..x..5..x..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 01 2012
STATUS
approved