Number of unlabeled 3-connected graphs with n edges.

Terms

a(0) =1a(1) =0a(2) =1a(3) =3a(4) =4a(5) =7a(6) =22a(7) =51a(8) =152a(9) =501a(10) =1739a(11) =6548a(12) =26260a(13) =110292a(14) =483545a(15) =2198726a(16) =10327116a(17) =49965520a(18) =248481062a(19) =1267987437a(20) =6630660484a(21) =35492360163a(22) =194283212876