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 A031326 #4 Mar 30 2012 18:56:23 %S A031326 1,6,9,16,26,31,40,42,47,52,55,56,72,74,78,82,85,88,89,91,102,110,137, %T A031326 147,151,158,169,175,178,184,186,191,207,214,215,221,224,229,230,237, %U A031326 239,264,281,282,290,300,304,305,315,319,336 %N A031326 Position of n-th 1 in A031324. %K A031326 nonn %O A031326 1,2 %A A031326 _Clark Kimberling_