OFFSET
1,2
COMMENTS
Column 3 of A215924.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..98
EXAMPLE
Some solutions for n=4
..x..0..x....x..0..x....x..0..x....x..0..x....x..0..x....x..0..x....x..0..x
..1..x..2....1..x..1....1..x..2....1..x..1....1..x..2....1..x..2....1..x..1
..x..3..x....x..2..x....x..0..x....x..2..x....x..0..x....x..3..x....x..2..x
..1..x..1....3..x..1....3..x..4....1..x..1....2..x..2....4..x..5....0..x..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 27 2012
STATUS
approved