%I A158827
%S A158827 1,4,20,110,640,3870,24084,153306,993978,6544242,43652340,294469974,
%T A158827 2006018748,13784115468,95444016984,665407010349,4667570034444,
%U A158827 32922870719664,233389493503968,1662048903052380,11885333877149532
%N A158827 The 4-th iteration of x*C(x) where C(x) is the Catalan function (A000108).
%o A158827 (PARI) {a(n)=local(F=serreverse(x-x^2+O(x^(n+1))),G=x); for(i=1,4,G=subst(F,
               x,G));polcoeff(G,n)}
%Y A158827 Cf. A158825, A158826, A158828, A158829.
%Y A158827 Sequence in context: A026127 A153295 A006770 this_sequence A026156 A025183 
               A014523
%Y A158827 Adjacent sequences: A158824 A158825 A158826 this_sequence A158828 A158829 
               A158830
%K A158827 nonn
%O A158827 1,2
%A A158827 Paul D. Hanna (pauldhanna(AT)juno.com), Mar 28 2009