A005643 Number of labeled irreducible 2-connected graphs with n edges.

1, 26, 1858, 236856, 53458832, 21494404400, 15580475076986, 20666605559464968, 50987322515860980236, 237747564913232367202656, 2125708395579372100915553094

Offset: 4

Author

N. J. A. Sloane

Keywords

• nonn

References

• N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

• T. R. S. Walsh, Counting labeled three-connected and homeomorphically irreducible two-connected graphs, J. Combin. Theory Ser. B 32 (1982), no. 1, 1-11.

Crossrefs

Cf. A054597.