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 A015079 #4 Mar 30 2012 17:20:37
%S A015079 1,1,122,1784993,3162420494366,677889092180295554010,
%T A015079 17582706239031734855147601736020,
%U A015079 55182061625844132594149408768243237640344385
%N A015079 q-Catalan numbers (binomial version) for q=-11.
%F A015079 {1 / (n+1)_q} {2 n choose n}_q.
%K A015079 nonn,easy
%O A015079 0,3
%A A015079 _Olivier Gérard_