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 A025236 #7 Feb 16 2020 03:17:45 %S A025236 1,3,3,12,30,111,363,1353,4917,18777,71769,280506,1103556,4395009, %T A025236 17622309 %N A025236 Duplicate of A014432. %K A025236 dead %O A025236 1,2