OFFSET
2,3
COMMENTS
Care is needed with "symmetric" terminology, which is variously used to mean both arc-transitive and both vertex- and edge-transitive.
The first known difference from A133181 (connected vertex- and edge-transitive graphs on n vertices) occurs at a(27), corresponding to the Doyle graph (which is both edge- and vertex-transitive but not arc-transitive). - Eric W. Weisstein, May 13 2017
LINKS
Marston Conder, Home Page (Contains tables of regular maps, hypermaps and polytopes, trivalent symmetric graphs, and surface actions)
Marston Conder, Connected symmetric (arc-transitive) graphs of order 2 to 30
Eric Weisstein's World of Mathematics, Arc-Transitive Graph
Eric Weisstein's World of Mathematics, Doyle Graph
Eric Weisstein's World of Mathematics, Edge-Transitive Graph
Eric Weisstein's World of Mathematics, Symmetric Graph
Eric Weisstein's World of Mathematics, Vertex-Transitive Graph
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, May 08 2017
STATUS
approved