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 A325474 #15 Jun 02 2025 17:23:48
%S A325474 0,0,1,20,204,1689,13303,90614,543116,2842431,13218770,55233883,
%T A325474 210199115,736166006,2395665563,7301022565,20981692199,57188601747,
%U A325474 148588072319,369611918382,883579452509,2036672785494,4539872512172,9811474182969,20605911433906,42141179374995
%N A325474 Number of connected n-regular loopless multigraphs on eight unlabeled nodes.
%C A325474 Multigraphs are loopless.
%C A325474 Initial terms computed using 'Nauty and Traces' (see the link).
%H A325474 Andrew Howroyd, <a href="/A325474/b325474.txt">Table of n, a(n) for n = 0..30</a>
%H A325474 Brendan McKay and Adolfo Piperno, <a href="http://pallini.di.uniroma1.it">Nauty and Traces</a>
%o A325474 (nauty) for ((n=0;n<11;n++)); do geng -c -d1 8 -q | multig -r${n} -u; done
%Y A325474 Row n=8 of A328682.
%Y A325474 Cf. A324217, A324218.
%K A325474 nonn,hard
%O A325474 0,4
%A A325474 _Natan Arie Consigli_, Aug 09 2019
%E A325474 Terms a(13) and beyond from _Andrew Howroyd_, Mar 17 2020