OFFSET
0,10
LINKS
EXAMPLE
a(0)=0 because even though the null graph (on zero vertices) is vacuously 7-regular and connected, since it is acyclic, it has infinite girth.
The a(7)=1 graph is the complete bipartite graph K_{7,7}.
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Jason Kimberley, Feb 28 2011
STATUS
approved