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 A219903 #8 Jan 29 2023 08:01:59 %S A219903 0,0,0,0,4,15,48,111,238,441,782,1279,2029,3055,4499,6390 %N A219903 Number of isomorphism classes of IPR nanocones with 4 pentagons and a symmetric boundary of length n. %H A219903 Gunnar Brinkmann and Nico Van Cleemput, <a href="https://doi.org/10.1016/j.dam.2011.06.014">Classification and generation of nanocones</a>, Discrete Applied Mathematics, 159 (2011), 1528-1539. %Y A219903 Cf. A197988, A198014, A198015, A198016, A198086. %Y A219903 Cf. A219901, A219902, A219904, A219905. %K A219903 nonn,more %O A219903 0,5 %A A219903 _N. J. A. Sloane_, Dec 01 2012