OFFSET
0,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..50
EXAMPLE
Some solutions for n=3:
..x..0..x..1..x..2....x..0..x..1..x..2....x..0..x..1..x..2....x..0..x..1..x..0
..3..x..4..x..0..x....3..x..2..x..3..x....2..x..3..x..4..x....2..x..3..x..4..x
..x..2..x..5..x..4....x..4..x..0..x..1....x..1..x..2..x..1....x..5..x..2..x..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 22 2012
EXTENSIONS
a(0)=1 prepended and terms a(9) and beyond from Andrew Howroyd, Jun 25 2017
STATUS
approved