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 A088391 #3 Mar 30 2012 17:29:10 %S A088391 2,1,0,5,4,0,143,25,0,2,1,0,77,715,0,125,5882353,0,52631579,1,0,5, %T A088391 4347826087,0,8,385,0,3575,3448275862069,0,0,625,0,29411765,286,0,0, %U A088391 263157895,0,5,0,0,0,25,0,21739130435,2127659574468085106383,0 %N A088391 a(n)=A069521(n)/n. %Y A088391 Cf. A069521. %K A088391 nonn %O A088391 1,1 %A A088391 _Ray Chandler_, Sep 28 2003