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 A348802 #7 Jan 17 2025 12:29:28 %S A348802 0,1,4,19,106,709,5356,44558,397146,3716039,35967272,356784008, %T A348802 3605014966,36955965852,383320824698 %N A348802 a(n) = number of non-orientable genus 1 maps with n edges. %H A348802 Evgeniy Krasko and Alexander Omelchenko, <a href="https://arxiv.org/abs/1712.10139">Enumeration of Unsensed Orientable Maps on Surfaces of a Given Genus</a>, arXiv:1712.10139 [math.CO], 2017, see Appendix Table 5. %Y A348802 Column k=1 of A380235. %Y A348802 Cf. A348803, A348804, A348805, A348806, A348807, A348808, A348809, A348810, A348811. %K A348802 nonn,more %O A348802 0,3 %A A348802 _Michael De Vlieger_, Nov 01 2021