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 A292971 #17 Dec 30 2018 19:21:14 %S A292971 1,4,23,185,1647,16455,169734,1805028,19472757,212603589,2341275180, %T A292971 25969695728,289782412836,3250137255678 %N A292971 Number of 4-regular maps with n vertices on the torus, up to orientation-preserving isomorphisms. %H A292971 E. Krasko, A. Omelchenko, <a href="https://arxiv.org/abs/1709.03225">Enumeration of r-regular Maps on the Torus. Part I: Enumeration of Rooted and Sensed Maps</a>, arXiv preprint arXiv:1709.03225 [math.CO], 2017. %H A292971 E. Krasko, A. Omelchenko, <a href="https://doi.org/10.1016/j.disc.2018.07.013">Enumeration of r-regular maps on the torus. Part I: Rooted maps on the torus, the projective plane and the Klein bottle. Sensed maps on the torus</a>, Discrete Mathematics, Volume 342, Issue 2, February 2019, pp. 584-599. %Y A292971 Cf. A292408 (3-regular), A292972 (5-regular), A292974 (6-regular). %K A292971 nonn,more %O A292971 1,2 %A A292971 _Evgeniy Krasko_, Sep 27 2017