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 A026236 #7 Sep 22 2019 23:01:24 %S A026236 1,2,3,4,6,7,5,9,10,12,15,16,19,21,22,8,24,27,30,31,34,36,37,40,42,45, %T A026236 49,51,52,54,11,55,57,64,66,69,70,75,76,79,13,82,84,87,90,91,96,14,97, %U A026236 99,100,106,112,114,115,117,120,121,126,129 %N A026236 a(n) = (s(n) + 1)/2, where s(n) is the n-th odd number in A026234. %K A026236 nonn %O A026236 1,2 %A A026236 _Clark Kimberling_ %E A026236 Title corrected by _Sean A. Irvine_, Sep 22 2019