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 A026237 #8 Sep 23 2019 05:35:51 %S A026237 1,2,3,4,7,5,6,16,8,9,31,10,41,48,11,12,63,72,13,84,14,15,105,17,115, %T A026237 126,18,140,151,19,20,166,179,21,195,22,23,214,225,24,237,25,251,268, %U A026237 26,286,301,306,27,324,28,29,345,30,32,366,33,382,391,402,407,426,437,34,457,35,481 %N A026237 a(n) = position of n in A026236. %K A026237 nonn %O A026237 1,2 %A A026237 _Clark Kimberling_ %E A026237 More terms from _Sean A. Irvine_, Sep 22 2019