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 A173990 #13 Mar 13 2022 12:04:00 %S A173990 1,1,3,13,75,530,4449,43236 %N A173990 Incorrect version of A007178. %C A173990 Name was: Dimensions of components for the operad of level algebras. %K A173990 dead %O A173990 1,3 %A A173990 _Vladimir Dotsenko_, Mar 04 2010