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 A026221 #14 Feb 12 2023 06:03:49 %S A026221 2,1,5,6,8,3,11,4,14,15,17,18,20,7,23,24,26,9,29,10,32,33,35,12,38,13, %T A026221 41,42,44,45,47,16,50,51,53,54,56,19,59,60,62,21,65,22,68,69,71,72,74, %U A026221 25,77,78,80,27,83,28,86,87,89,30,92,31,95 %N A026221 Duplicate of A026214. %C A026221 Is this the same as A026214? [From _R. J. Mathar_, Oct 23 2008] %C A026221 Original title: a(n) = position of n in A026220. %K A026221 dead %O A026221 1,1 %A A026221 _Clark Kimberling_