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 A246989 #5 Feb 22 2023 12:00:33 %S A246989 1,17,206,6029,508321 %N A246989 Number of isomorphism classes of oriented matroids of dimension n and cardinality n+4. %H A246989 Lukas Finschi, <a href="https://finschi.com/math/om/">Homepage of Oriented Matroids</a> %Y A246989 A diagonal of A063804. %K A246989 nonn,more %O A246989 1,2 %A A246989 _N. J. A. Sloane_, Sep 17 2014