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 A005841 M3641 #32 Dec 17 2021 11:30:12 %S A005841 1,4,31,1294,274148 %N A005841 Number of 4-dimensional polytopes with n vertices. %D A005841 H. T. Croft, K. J. Falconer and R. K. Guy, Unsolved Problems in Geometry, B15. %D A005841 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A005841 Lukas Finschi, <a href="http://www.ifor.math.ethz.ch/publications/diss_finschi">A Graph Theoretical Approach for Reconstruction and Generation of Oriented Matroids</a>, A dissertation submitted to the Swiss Federal Institute of Technology, Zurich for the degree of Doctor of Mathematics, 2001. See Table 7.5. %H A005841 Moritz Firsching, <a href="https://arxiv.org/abs/1803.05205">The complete enumeration of 4-polytopes and 3-spheres with nine vertices</a>, arXiv:1803.05205 [math.MG], 2018. %H A005841 Fukuda, Komei; Miyata, Hiroyuki; Moriyama, Sonoko. <a href="http://arxiv.org/abs/1204.0645">Complete Enumeration of Small Realizable Oriented Matroids</a>. Discrete Comput. Geom. 49 (2013), no. 2, 359--381. MR3017917. Also arXiv:1204.0645. - From _N. J. A. Sloane_, Feb 16 2013 %Y A005841 Cf. A000944. %K A005841 nonn,hard,nice,more %O A005841 5,2 %A A005841 _N. J. A. Sloane_ %E A005841 a(9), from the paper by M. Firshing, added by _Jud McCranie_, Jan 30 2020