OFFSET
1,1
COMMENTS
Column 7 of A230940
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
Some solutions for n=4
..0..x..2..x..2..x..0..x..2....0..x..0..x..0..x..2..x..2
..x..1..x..3..x..1..x..3..x....x..1..x..3..x..1..x..3..x
..0..x..0..x..2..x..2..x..2....0..x..2..x..0..x..0..x..2
..x..3..x..1..x..3..x..0..x....x..3..x..1..x..1..x..3..x
..2..x..0..x..0..x..1..x..3....0..x..2..x..2..x..0..x..2
..x..1..x..3..x..3..x..2..x....x..1..x..1..x..3..x..3..x
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 01 2013
STATUS
approved