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 A026207 #10 Dec 07 2021 11:54:31 %S A026207 1,2,5,3,4,11,13,6,17,7,8,23,9,10,29,31,12,35,37,14,41,15,16,47,49,18, %T A026207 53,19,20,59,21,22,65,67,24,71,25,26,77,27,28,83,85,30,89,91,32,95,33, %U A026207 34,101,103,36,107,109,38,113,39,40,119,121 %N A026207 Duplicate of A026183. %K A026207 dead %O A026207 1,2