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

A010355

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

Terms

    a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =4a(6) =7a(7) =16a(8) =42a(9) =111a(10) =331a(11) =1094a(12) =3829a(13) =14380a(14) =57069a(15) =237188a(16) =1027929a(17) =4622588a(18) =21494274a(19) =103077677a(20) =508743475a(21) =2579847563a(22) =13422868110a(23) =71570635306a(24) =390670937143

External references