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 A060906 #14 May 16 2025 09:58:51
%S A060906 1,1,3,12,73,556,4737,44122,453441,5186664,65671201,906052654,
%T A060906 13418086497,211472682604,3535616946513,62621439810066,
%U A060906 1172370604136833,23118679430573008,478329265510033473,10349724555927678934,233633352312272612001,5492655756487132979796
%N A060906 E.g.f.: exp(x*exp(x) + 1/3*x^3*exp(x)^3).
%C A060906 The number of functions from {1,2,...,n} to itself such that f(x)=f^4(x). - _Geoffrey Critzer_, Sep 18 2012
%D A060906 I. P. Goulden and D. M. Jackson, Combinatorial Enumeration, Wiley, N.Y., 1983.
%H A060906 Alois P. Heinz, <a href="/A060906/b060906.txt">Table of n, a(n) for n = 0..200</a>
%F A060906 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 = 1, m = 3.
%t A060906 nn=20;a=x Exp[x];Range[0,nn]!CoefficientList[Series[Exp[a+a^3/3],{x,0,nn}],x] (* _Geoffrey Critzer_, Sep 18 2012 *)
%Y A060906 Cf. A000949 - A000951, A060905 - A060913.
%Y A060906 Column k=4 of A245501.
%K A060906 nonn
%O A060906 0,3
%A A060906 _Vladeta Jovovic_, Apr 07 2001