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 A015035 #4 Mar 30 2012 17:20:37
%S A015035 1,1,26,16401,256754526,100333200992026,979891646733527648276,
%T A015035 239235033472903543542533976401,
%U A015035 1460179250460591912887733380834635929526
%N A015035 q-Catalan numbers (binomial version) for q=5.
%F A015035 {1 / (n+1)_q} {2 n choose n}_q.
%K A015035 nonn,easy
%O A015035 0,3
%A A015035 _Olivier Gérard_