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 A060909 #3 May 10 2013 12:44:44
%S A060909 1,1,3,18,133,1236,13767,176674,2547561,40614408,708601771,
%T A060909 13433957934,275200324797,6061423076476,142868492357151,
%U A060909 3587417860571346,95560989416582353,2690066742390963216,79752454967110250835
%N A060909 E.g.f.: exp(x*exp(x*exp(x)) + 1/3*x^3*exp(x*exp(x))^3).
%D A060909 I. P. Goulden and D. M. Jackson, Combinatorial Enumeration, Wiley, N.Y., 1983.
%F A060909 E.g.f.: exp(Sum_{d|m} T_k^d/d), where T_k = x*exp(T_(k - 1)), k >= 1, T_0 = x; k = 2, m = 3.
%Y A060909 Cf. A000949 - A000951, A060905 - A060913.
%K A060909 nonn
%O A060909 0,3
%A A060909 _Vladeta Jovovic_, Apr 07 2001