OFFSET
1,2
COMMENTS
Diagonal of A216991
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..11
EXAMPLE
Some solutions for n=3 (movement: 0=n 1=e 2=s 3=w)
..1..2..3....1..2..3....2..3..3....1..2..3....1..2..3....1..1..2....2..3..3
..2..2..3....0..3..2....1..2..0....1..1..0....0..3..3....0..2..3....2..0..3
..1..1..0....0..3..3....0..3..3....0..3..3....0..1..0....0..1..0....1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 21 2012
STATUS
approved