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 A129433 #19 Mar 21 2020 20:11:35
%S A129433 1,4,13,66,384,3369,40365,675368,14843787,412444439,14024069358,
%T A129433 570883006810,27368160642418,1525274952640101,97766102550401217,
%U A129433 7141331463919539567,589726897233157151109,54669618693986578729541,5653861386413841612952683,648651469510725736002532451
%N A129433 Number of isomorphism classes of 6-regular multigraphs of order n, loops allowed.
%C A129433 Initial terms computed using software at http://users.cecs.anu.edu.au/~bdm/nauty/
%H A129433 R. C. Read, <a href="http://dx.doi.org/10.1112/jlms/s1-34.4.417">The enumeration of locally restricted graphs (I)</a>, J. London Math. Soc. 34 (1959) 417-436. [From _Jason Kimberley_, Oct 05 2009]
%F A129433 a(n) = N\{S_n[S_6] * S_{3n}[S_2]\}. [Equation (5.8) of Read 1959]
%F A129433 Euler transform of A129432. - _Andrew Howroyd_, Mar 15 2020
%Y A129433 Column k=6 of A167625.
%Y A129433 Cf. A129432, A129422, A129427, A129429, A129431, A129435, A129437.
%K A129433 nonn
%O A129433 1,2
%A A129433 _Brendan McKay_, Apr 15 2007
%E A129433 Using the formula, new terms a(13), Oct 05 2009, and a(14)-a(16), Nov 09 2009, were computed in MAGMA by _Jason Kimberley_
%E A129433 a(17)-a(20) from _Andrew Howroyd_, Mar 21 2020