OFFSET
1,2
COMMENTS
Column 7 of A220725.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..151
EXAMPLE
Some solutions for n=3 0=self 1=nw 3=ne 4=w 6=e 7=sw 9=se (reciprocal directions total 10)
.00.67.47.00.00.79.00...00.67.49.00.67.46.47...00.67.47.69.46.46.47
.36.34.67.49.37.79.17...36.46.47.13.00.39.00...39.37.00.00.17.36.47
.00.36.46.34.13.36.14...00.36.46.46.46.46.14...36.14.00.36.46.34.00
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 18 2012
STATUS
approved