1,7

Table of n, a(n) for n=1..11.

F. Hüffner, tinygraph, software for generating integer sequences based on graph properties.

The smallest such graph is on 6 vertices, commonly called the "double gem."

Sequence in context: A221731 A290925 A020056 * A151330 A302871 A010913

Adjacent sequences: A086839 A086840 A086841 * A086843 A086844 A086845

nonn

Jim Nastos, Aug 08 2003

a(10) and a(11) added using tinygraph by Falk Hüffner, Jan 22 2016

approved