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 A129431 #21 Mar 22 2020 02:41:18
%S A129431 3,32,727,42703,5988679,1639714425,757559332934,541249158493444,
%T A129431 564262722366313620,822164422526588575949,1618567795242262158194706,
%U A129431 4188563149202582371775198174,13926836449718334345103644635724,58360974360850795591633858610837541
%N A129431 Number of isomorphism classes of 5-regular multigraphs of order 2n, loops allowed.
%C A129431 First seven terms were computed using software at http://users.cecs.anu.edu.au/~bdm/nauty/
%H A129431 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 A129431 a(n) = N\{S_{2n}[S_5] * S_{5n}[S_2]\}. - _Jason Kimberley_, Oct 05 2009
%F A129431 Euler transform of A129430. - _Andrew Howroyd_, Mar 15 2020
%Y A129431 Column k=5 of A167625.
%Y A129431 Cf. A129430, A129420, A129427, A129429, A129433, A129435, A129437.
%K A129431 nonn
%O A129431 1,1
%A A129431 _Brendan McKay_, Apr 15 2007
%E A129431 Using equation (5.8) of Read 1959, new terms a(8)-a(10) were computed in MAGMA during 2009 by _Jason Kimberley_, Dec 22 2010
%E A129431 a(11)-a(14) from _Andrew Howroyd_, Mar 21 2020