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 A061815 #3 May 10 2013 12:44:46
%S A061815 1,1,2,5,14,42,133,433,1455,4958,17247,60502,215353,770865,2789365,
%T A061815 10134529,37130526,136451349,504837219,1872121732,6980767968,
%U A061815 26078614284,97872756530,367861581953,1388061197005,5243972732886
%N A061815 G.f. A(x) satisfies A(x) = 1+Sum_{j=0 to infinity} ((1 + x^(j+1)*A(x))^a_j-1).
%Y A061815 Cf. A061396.
%K A061815 nonn
%O A061815 0,3
%A A061815 _Vladeta Jovovic_, Jun 22 2001