Number of 3-connected nets with n edges.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =2a(6) =9a(7) =11a(8) =37a(9) =79a(10) =249a(11) =671a(12) =2182a(13) =6692a(14) =22131a(15) =72405a(16) =243806a(17) =822788a(18) =2815119a(19) =9679205a(20) =33551192a(21) =116900081a(22) =409675567a(23) =1442454215a(24) =5102542680a(25) =18124571838a(26) =64634480340a(27) =231334873091a(28) =830828150081