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 A022304 #3 Mar 30 2012 18:55:50 %S A022304 1,3,6,9,10,12,13,16,18,19,21,24,25,27,28,30,33,36,37,39,42,44,45,47, %T A022304 48,51,54,55,57,60,63,64,66,67,69,72,74,75,78,81,82,84,87,90,91,93,94, %U A022304 97,99,100,102,105,108,109,111,112,114,117,118,120,121,124 %N A022304 Index of n-th 1 in A022303. %K A022304 nonn %O A022304 0,2 %A A022304 _Clark Kimberling_