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 A102794 #14 Aug 21 2019 22:56:04 %S A102794 36,4356,443556,44435556,4444355556,444443555556,44444435555556, %T A102794 4444444355555556,444444443555555556,44444444435555555556, %U A102794 4444444444355555555556 %N A102794 Duplicate of A075415. %K A102794 dead %O A102794 1,1