1,16
a(18) is known to be at least 13
Table of n, a(n) for n=1..17.
Eric Weisstein's World of Mathematics, Hypohamiltonian Graph
Sequence in context: A115527 A050920 A001231 * A089418 A124856 A061858
Adjacent sequences: A141147 A141148 A141149 * A141151 A141152 A141153
nonn,more
Eric W. Weisstein, Jun 11, 2008
approved