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 A030591 #4 Mar 30 2012 18:56:19 %S A030591 10,12,14,53,56,59,88,91,94,97,100,103,106,107,109,110,112,113,115, %T A030591 118,121,124,127,130,133,136,139,161,164,167,215,218,221,269,272,275, %U A030591 330,334,338,402,406,410,449,453,457,461,465,469 %N A030591 Position of n-th 2 in A030588. %K A030591 nonn %O A030591 1,1 %A A030591 _Clark Kimberling_