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 A161898 #9 Jul 20 2023 09:42:46 %S A161898 1,2,5,14,41,124,384,1211,3871,12503,40721,133539,440483 %N A161898 Incorrect version of A159772. %K A161898 dead %O A161898 0,2 %A A161898 _Gary W. Adamson_, Jun 21 2009