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 A015037 #4 Mar 30 2012 17:20:37
%S A015037 1,1,37,48205,2251069309,3781498934895517,228658497157753687896157,
%T A015037 497741851942315778953758074621149,
%U A015037 39005151256058786340132305925534793975511005
%N A015037 q-Catalan numbers (binomial version) for q=6.
%F A015037 {1 / (n+1)_q} {2 n choose n}_q.
%K A015037 nonn,easy
%O A015037 0,3
%A A015037 _Olivier Gérard_