Number of isomorphism classes of connected 3-regular simple graphs of order 2n with loops and semi-edges allowed.

A243392

Number of isomorphism classes of connected 3-regular simple graphs of order 2n with loops and semi-edges allowed.

Terms

    a(0) =2a(1) =3a(2) =4a(3) =12a(4) =22a(5) =68a(6) =166a(7) =534a(8) =1589a(9) =5464a(10) =18579a(11) =68320a(12) =255424a(13) =1000852a(14) =4018156a(15) =16671976a(16) =70890940a(17) =309439942a(18) =1381815168a(19) =6310880471a(20) =29428287639a(21) =140012980007a(22) =678970863717

External references