OFFSET
1,2
COMMENTS
Column 7 of A215297
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
Some solutions for n=3
..x..0..x..1..x..3..x....x..0..x..2..x..5..x....x..0..x..1..x..3..x
..2..x..4..x..6..x..9....3..x..6..x..8..x..9....5..x..6..x..8..x..9
..x..5..x..7..x..8..x....x..1..x..4..x..7..x....x..2..x..4..x..7..x
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 07 2012
STATUS
approved