OFFSET
0,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..200 (terms n = 1..135 from R. H. Hardin)
EXAMPLE
Some solutions for n=3 0=self 1=nw 2=n 3=ne 4=w 6=e 7=sw 8=s 9=se (reciprocal directions total 10)
..0..0..0..0..0..7..0....0..0..9..6..4..0..0....0..6..4..0..0..7..0
..6..4..7..9..3..8..0....6..4..9..1..0..7..0....6..4..8..9..3..6..4
..0..3..0..0..1..2..0....0..0..0..1..3..6..4....0..0..2..0..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 17 2012
STATUS
approved