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 A348812 #6 Nov 01 2021 22:30:30 %S A348812 42,3846,300048,22171638,1595739432,113110095540,7939173652032, %T A348812 553477015433958,38395171272416568,2653558455501023196 %N A348812 a(n) is the number of rooted 6-regular maps on the Klein bottle with n vertices and 2n edges. %H A348812 Evgeniy Krasko and Alexander 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:1709.03225 [math.CO], 2017. See also <a href="https://doi.org/10.1016/j.disc.2018.07.013">Disc. Math.</a> (2019) Vol. 342, Issue 2, 584-599. Table 3. %Y A348812 Cf. A323276, A323279, A323281. %K A348812 nonn,more %O A348812 1,1 %A A348812 _Michael De Vlieger_, Nov 01 2021