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 A026604 #4 Mar 30 2012 18:56:09 %S A026604 1,3,6,8,11,12,15,16,18,20,23,24,27,28,30,31,33,36,39,40,42,43,45,48, %T A026604 50,53,54,56,59,60,63,64,66,67,69,72,75,76,78,79,81,84,86,89,90,91,93, %U A026604 96,98,101,102,105,106,108,111,112,114,115,117 %N A026604 a(n) = s(1) + s(2) + ... + s(n), where s = A026600. %K A026604 nonn %O A026604 1,2 %A A026604 _Clark Kimberling_