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 A015060 #4 Mar 30 2012 17:20:37
%S A015060 1,1,26,16151,252685526,98680063948026,963721858629894354276,
%T A015060 235281247773992038934697401151,
%U A015060 1436045713119204599875184429195350135526
%N A015060 q-Catalan numbers (binomial version) for q=-5.
%F A015060 {1 / (n+1)_q} {2 n choose n}_q.
%K A015060 nonn,easy
%O A015060 0,3
%A A015060 _Olivier Gérard_