OFFSET
1,3
COMMENTS
Column 3 of A216460
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..95
EXAMPLE
Some solutions for n=4
..0..x..1....0..x..1....0..x..1....0..x..1....0..x..1....0..x..1....0..x..1
..x..2..x....x..2..x....x..2..x....x..2..x....x..2..x....x..2..x....x..2..x
..3..x..4....0..x..1....1..x..3....0..x..3....3..x..4....3..x..4....3..x..1
..x..1..x....x..2..x....x..4..x....x..2..x....x..0..x....x..2..x....x..0..x
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 07 2012
STATUS
approved