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 A143725 #6 Jan 17 2022 11:08:27 %S A143725 114478,1448516,16306649,99694693,473864807,1479135833,3117091975, %T A143725 3935668832,2627619810,711868010,49305639,182200 %N A143725 Numbers of non-orientable triangulated surfaces with 12 vertices and genus n. %H A143725 F. H. Lutz, <a href="https://page.math.tu-berlin.de/~lutz/stellar/surfaces.html#n_vertices_or-">The Manifold Page: Surfaces</a> %H A143725 T. Sulanke and F. H. Lutz, <a href="https://arxiv.org/abs/math/0610022">Isomorphism free lexicographic enumeration of triangulated surfaces and 3-manifolds</a>, May 21, 2007. See Table 4, p. 9. %Y A143725 Cf. A108239. %K A143725 nonn,fini,full %O A143725 1,1 %A A143725 _Jonathan Vos Post_, Aug 29 2008