Number of unlabeled nonseparable (or 2-connected) graphs (or blocks) with n nodes.

A002218

Number of unlabeled nonseparable (or 2-connected) graphs (or blocks) with n nodes.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =3a(4) =10a(5) =56a(6) =468a(7) =7123a(8) =194066a(9) =9743542a(10) =900969091a(11) =153620333545

External references