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 A257599 #11 May 09 2021 02:28:12 %S A257599 1,2,2,3,2,4,2,4,4,4,6,2,6,8,6 %N A257599 Cusp numbers of terms of A091401. %H A257599 Yang-Hui He, John McKay, <a href="http://arxiv.org/abs/1505.06742">Sporadic and Exceptional</a>, arXiv:1505.06742 [math.AG], 2015. %Y A257599 Cf. A091401. %K A257599 nonn,fini,full %O A257599 1,2 %A A257599 _N. J. A. Sloane_, Jun 07 2015