OFFSET
1,2
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..40
FORMULA
EXAMPLE
Some solutions for n=5
..x..0..x..4..x....x..4..x..6..x....x..1..x..6..x....x..0..x..6..x
..1..x..3..x..7....0..x..1..x..9....0..x..2..x..3....3..x..4..x..9
..x..2..x..5..x....x..5..x..8..x....x..7..x..8..x....x..1..x..7..x
..8..x..9..x.10....2..x..3..x.10....4..x..5..x.11....5..x..8..x.11
..x..6..x.11..x....x..7..x.11..x....x..9..x.10..x....x..2..x.10..x
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 07 2012
STATUS
approved