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 A129423 #15 Jun 02 2025 15:57:03 %S A129423 1,7,263,90614,165041329,861723619902,10351918806321621, %T A129423 253216618556625008961,11542463442106815907796586, %U A129423 915449471830886733265105097578 %N A129423 Number of isomorphism classes of connected 7-regular loopless multigraphs of order 2n. %C A129423 Initial terms computed using software at http://users.cecs.anu.edu.au/~bdm/nauty/ %H A129423 Brendan McKay and Adolfo Piperno, <a href="http://pallini.di.uniroma1.it">Nauty and Traces</a> %F A129423 Inverse Euler transform of A129424. - _Andrew Howroyd_, Mar 21 2020 %o A129423 (nauty) geng -c -d1 $[2*$n] -q | multig -r7 -u # _Natan Arie Consigli_, Dec 20 2019 %Y A129423 Column k=7 of A328682. %Y A129423 Cf. A129424, A129434, A000421, A129417, A129419, A129421, A129425, A328682. %K A129423 nonn %O A129423 1,2 %A A129423 _Brendan McKay_, Apr 15 2007 %E A129423 a(7)-a(10) from _Andrew Howroyd_, Mar 21 2020