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 A026414 #8 Sep 27 2019 02:51:02 %S A026414 1,1,1,2,2,2,3,3,3,4,4,5,5,5,5,6,6,7,7,7,8,8,9,9,9,9,9,10,10,11,11,11, %T A026414 11,12,13,13,13,13,14,15,15,15,15,16,16,16,17,17,17,18,18,18,19,19,20, %U A026414 20,20,20,21,21,21,22,22,22,23,24,24,24,24,25,25,26,26,26,27,27 %N A026414 a(n) = greatest integer not found after first n in A026409. %K A026414 nonn %O A026414 2,4 %A A026414 _Clark Kimberling_ %E A026414 More terms from _Sean A. Irvine_, Sep 26 2019