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 A219895 #7 May 25 2018 14:40:53 %S A219895 3,26,1547,146487,16018987,1985766270,278601715904 %N A219895 Number of directed 3-regular graphs on n nodes without directed 2-cycles. %H A219895 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 A219895 Cf. A096368, A219889, A219890, A219891, A219892, A219893, A219894. %K A219895 nonn,more %O A219895 7,1 %A A219895 _N. J. A. Sloane_, Nov 30 2012