A243392 Number of isomorphism classes of connected 3-regular simple graphs of order 2n with loops and semi-edges allowed.

2, 3, 4, 12, 22, 68, 166, 534, 1589, 5464, 18579, 68320, 255424, 1000852, 4018156, 16671976, 70890940, 309439942, 1381815168, 6310880471, 29428287639, 140012980007, 678970863717, 3353545264060, 16857749613964, 86191265140699, 447951112379963, 2365177154077186

Offset: 1

Author

Nico Van Cleemput, Jun 04 2014

Keywords

• nonn

Links

• G. Brinkmann, N. Van Cleemput, T. Pisanski, Generation of various classes of trivalent graphs, Theoretical Computer Science 502, 2013, pp.16-29.

Crossrefs

Differs from A243391 only in the first term.

Extensions

a(23)-a(28) from Andrew Howroyd, May 06 2021