Number of unlabeled 3-connected nonplanar graphs with n edges.

Terms

a(0) =1a(1) =2a(2) =3a(3) =10a(4) =29a(5) =94a(6) =343a(7) =1291a(8) =5206a(9) =22061a(10) =96908a(11) =439837a(12) =2053916a(13) =9841412a(14) =48319944a(15) =242857491a(16) =1248629027a(17) =6563581656a(18) =35258560001a(19) =193463945790