cp's OEIS Frontend

A060911 E.g.f.: exp(x*exp(x*exp(x*exp(x))) + 1/2*x^2*exp(x*exp(x*exp(x)))^2).

%I A060911 #3 May 10 2013 12:44:45
%S A060911 1,1,4,25,218,2331,29152,417607,6746700,121312441,2401341056,
%T A060911 51857779689,1212621122176,30509979042115,821524617293304,
%U A060911 23563369209520711,717014609781379568,23064363484845390513
%N A060911 E.g.f.: exp(x*exp(x*exp(x*exp(x))) + 1/2*x^2*exp(x*exp(x*exp(x)))^2).
%D A060911 I. P. Goulden and D. M. Jackson, Combinatorial Enumeration, Wiley, N.Y., 1983.
%F A060911 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 = 3, m = 2.
%Y A060911 Cf. A000949 - A000951, A060905 - A060913.
%K A060911 nonn
%O A060911 0,3
%A A060911 _Vladeta Jovovic_, Apr 07 2001