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 A176251 #7 Jan 30 2021 02:32:31 %S A176251 5,23,41,113,131,311,2111,10211,20021,101021,101111 %N A176251 Incorrect duplicate of A062341. %K A176251 dead %O A176251 1,1 %A A176251 Ulrich Krug (leuchtfeuer37(AT)gmx.de), Apr 13 2010