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 A026278 #4 Mar 30 2012 18:56:05 %S A026278 4,6,8,11,14,17,19,22,24,27,29,32,35,37,40,43,45,48,51,53,56,58,61,64, %T A026278 66,69,71,74,77,79,82,84,87,90,92,95,98,100,103,105,108,111,113,116, %U A026278 119,121,124,126,129,132,134,137,140,142,145 %N A026278 a(n) = greatest k such that s(k) = n, where s = A026276. %K A026278 nonn %O A026278 1,1 %A A026278 _Clark Kimberling_