This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A129416 #16 Mar 19 2020 14:15:13 %S A129416 1,3,9,32,135,709,4637,38374,391473,4764778,66913591,1056886475, %T A129416 18446472265,351482430368,7247888726269,160671989129665, %U A129416 3808499268504548,96094161981827499,2570930535917564366,72688753062897675445 %N A129416 Number of isomorphism classes of 3-regular loopless multigraphs of order 2n. %C A129416 Initial terms computed using software at http://users.cecs.anu.edu.au/~bdm/nauty/ %H A129416 L. Travis, <a href="http://arxiv.org/abs/math/9811127">Graphical Enumeration: A Species-Theoretic Approach</a>, arXiv:math/9811127 [math.CO], 1998.; Ph.D. thesis, Brandeis University, 1999, Section 4.3. %F A129416 Euler transform of A000421. %Y A129416 Column k=3 of A333330. %Y A129416 Cf. A000421 (connected, inv. Eul. trans.), A129427, A129418, A129420, A129422, A129424, A129426. %K A129416 nonn %O A129416 1,2 %A A129416 _Brendan McKay_, Apr 15 2007 %E A129416 a(13)-a(20) from _Andrew Howroyd_, Mar 19 2020