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 A117344 #7 Dec 21 2017 15:59:14 %S A117344 1,2,3,5,6,7,10,11,14,15,17,19,21,23,26,29,30,33,34,35,38,39,41,42,43, %T A117344 46,47,51,53,55,57,59,61,65,66,69,70,71,74,77,78,79,82,83,86,89,91 %N A117344 Duplicate of A117204. %K A117344 dead %O A117344 1,2