2,1
a(5) = 2000 is realized by Petersen graph, a(7) = 50421 is realized by the Heawood graph
When n=2, the only cubic graph on 2n vertices is the complete graph K4 with 16 spanning trees.
Cf. A020871.
Sequence in context: A187457 A056118 A134606 * A153157 A113849 A046453
Adjacent sequences: A108938 A108939 A108940 * A108942 A108943 A108944
nonn
Gordon Royle (gordon(AT)maths.uwa.edu.au), Jul 20 2005