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 A085940 #10 Oct 14 2018 16:36:23 %S A085940 1,2,4,8,16,32,64,128,256,512,2,6,18,54,162,486,1458,4374,13122,39366, %T A085940 4 %N A085940 After correction, duplicate of A061509. %K A085940 dead %O A085940 0,2