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 A026216 #6 Feb 05 2020 15:23:45 %S A026216 1,4,2,3,10,12,5,16,6,7,22,8,9,28,30,11,34,36,13,40,14,15,46,48,17,52, %T A026216 18,19,58,20,21,64,66,23,70,24,25,76,26,27,82,84,29,88,90,31,94,32,33, %U A026216 100,102,35,106,108,37,112,38,39,118,120,41 %N A026216 Duplicate of A026177. %K A026216 dead %O A026216 1,2