OFFSET
2,2
COMMENTS
The resistances between any two nodes of the graph are counted.
All resistances in A337517 can be obtained by serial combinations of resistances of one or more 2-connected loopless multigraphs.
EXAMPLE
a(2)=1 since the only multigraph with 2 edges is a double edge graph which forms resistance 1/2.
For n=4, there are a quadruple edge graph (resistance 1/4), a triangle graph with one double edge (2/5 between double edge and 3/5 between single edge) and square graph (3/4 between neighbor nodes and 1 between opposite nodes) so a(4)=5.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Zhao Hui Du, May 23 2023
STATUS
approved