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 A019504 #12 Dec 17 2021 05:43:49 %S A019504 1,2,5,16,67,324,1820 %N A019504 Number of simplices in minimal corner-slicing triangulation of n-cube. %D A019504 H. T. Croft, K. J. Falconer and R. K. Guy, Unsolved Problems in Geometry, C9. %H A019504 R. B. Hughes and M. R. Anderson, <a href="https://doi.org/10.1016/0012-365X(95)00075-8">Simplexity of the cube</a>, Discr. Math., 158 (1996), 99-150. %Y A019504 Cf. A019502, A019503. %K A019504 nonn,hard,nice,more %O A019504 1,2 %A A019504 _N. J. A. Sloane_