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 A219893 #12 Feb 06 2022 15:00:43 %S A219893 1,7,5021,79818336,1775668832509 %N A219893 Number of directed 6-regular graphs on n nodes. %H A219893 Gunnar Brinkmann, <a href="https://doi.org/10.1016/j.disc.2012.09.014">Generating regular directed graphs</a>, Discrete Math., 313 (2012), 1-7. %Y A219893 Column k=6 of A350910. %Y A219893 Cf. A096368, A219889, A219890, A219891, A219892. %K A219893 nonn,more %O A219893 7,2 %A A219893 _N. J. A. Sloane_, Nov 30 2012