The Folkman graph is a semisymmetric graph that has the minimum possible number of nodes (20) (Skiena 1990, p. 186). It
is implemented in the Wolfram Language
as GraphData["FolkmanGraph"]
and illustrated above in several symmetric embeddings.
The Folkman graph has eight distinct generalized LCF notations, three with exponent 5 and five with exponent 1, illustrated above.