OFFSET
1,1
COMMENTS
Column 7 of A231131
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
Some solutions for n=2
..0..x..1..x..0..x..1..x....0..x..1..x..0..x..2..x....0..x..1..x..2..x..0..x
..x..1..x..0..x..1..x..0....x..2..x..1..x..2..x..0....x..2..x..1..x..0..x..2
..2..x..0..x..1..x..2..x....1..x..1..x..2..x..1..x....1..x..0..x..0..x..1..x
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2013
STATUS
approved