OFFSET
2,1
COMMENTS
a(5) = 2000 is realized by Petersen graph, a(7) = 50421 is realized by the Heawood graph.
EXAMPLE
When n=2, the only cubic graph on 2n vertices is the complete graph K4 with 16 spanning trees.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Gordon F. Royle, Jul 20 2005
STATUS
approved