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 A026189 #7 Jan 31 2020 04:25:06 %S A026189 1,4,2,7,3,9,10,13,5,15,6,17,18,21,8,24,25,27,28,31,11,33,12,35,36,39, %T A026189 14,41,42,44,45,48,16,51,52,54,55,58,19,60,20,62,63,66,22,68,23,70,71, %U A026189 74,26,77,78,80,81,84,29,87,30,89,90,93,32 %N A026189 Position of n in A026188. %K A026189 nonn %O A026189 1,2 %A A026189 _Clark Kimberling_ %E A026189 Edited by _N. J. A. Sloane_, Jan 31 2020