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 A051249 #9 Aug 20 2019 09:36:38 %S A051249 1,1,1,1,1,2,7,1044,1788782616656,234431745534048922731115555415680, %T A051249 1994324729203114587259985605157804740271034553359179870979936357974016 %N A051249 Pure 4-dimensional simplicial complexes on n unlabeled nodes. %H A051249 Alois P. Heinz, <a href="/A051249/b051249.txt">Table of n, a(n) for n = 0..15</a> %Y A051249 Cf. A000088, A000665, A051240. %Y A051249 Column k=5 of A309858. %K A051249 nonn %O A051249 0,6 %A A051249 _Vladeta Jovovic_ %E A051249 a(0)=1 prepended by _Alois P. Heinz_, Aug 20 2019