Number of strictly 2-connected graphs with n edges.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =3a(6) =7a(7) =15a(8) =39a(9) =107a(10) =324a(11) =1072a(12) =3778a(13) =14228a(14) =56568a(15) =235449a(16) =1021381a(17) =4596328a(18) =21383982a(19) =102594132a(20) =506544749a(21) =2569520447a(22) =13372902590a(23) =71322154244a(24) =389402949706