Number of unlabeled 2-connected minimally 2-edge-connected graphs with n nodes.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =10a(6) =19a(7) =42a(8) =92a(9) =225a(10) =564a(11) =1501a(12) =4127a(13) =11809a(14) =34713a(15) =104904a(16) =323778a(17) =1019538a(18) =3265502a(19) =10624881a(20) =35065697a(21) =117289911a(22) =397290416a(23) =1362060455a(24) =4724272231a(25) =16572501190a(26) =58782486855a(27) =210782826628a(28) =763991002957