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 A031330 #4 Mar 30 2012 18:56:23 %S A031330 4,12,13,32,36,46,60,68,71,90,117,120,123,136,143,148,165,176,177,180, %T A031330 181,240,248,266,274,279,289,297,313,322,330,333,335,345,348,355,368, %U A031330 380,387,388,393,407,412,419,420,440,456,458 %N A031330 Position of n-th 5 in A031324. %K A031330 nonn %O A031330 1,1 %A A031330 _Clark Kimberling_