OFFSET
1,1
COMMENTS
Column 7 of A220553.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
Some solutions for n=3 0=self 2=n 3=ne 4=w 6=e 7=sw 8=s (reciprocal directions total 10)
..0..7..7..7..0..0..0....0..7..8..8..0..6..4....0..7..7..6..4..6..4
..3..3..3..7..7..7..0....3..0..2..2..0..0..7....3..3..7..0..6..4..0
..0..0..3..3..3..0..0....0..6..4..0..0..3..0....0..3..0..0..6..4..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 15 2012
STATUS
approved