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 A026197 #6 Feb 05 2020 15:36:05 %S A026197 1,3,4,2,7,9,10,12,13,5,16,6,19,21,22,8,25,27,28,30,31,11,34,36,37,39, %T A026197 40,14,43,15,46,48,49,17,52,18,55,57,58,20,61,63,64,66,67,23,70,24,73, %U A026197 75,76,26,79,81,82,84,85,29,88,90,91,93,94 %N A026197 Duplicate of A026178. %K A026197 dead %O A026197 1,2