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%I #2 Mar 30 2012 18:37:20
%S 1,3,21,289,7566,380424,37361616,7252471584,2799853666176,
%T 2155959119115264,3315891500224031232,10193070293871040606464,
%U 62646640175842537242599936,769927299959295414569740867584
%N G.f. satisfies: A(x) = (1 + x*A(2x))^3.
%F Self-convolution cube of A171200 where a(n) = A171200(n+1)/2^n for n>=0.
%o (PARI) {a(n)=local(A=1+x+x*O(x^n)); for(i=0, n, A=(1+x*subst(A, x, 2*x))^3); polcoeff(A, n)}
%Y Cf. A135868, A171200, A171202-A171211.
%K nonn
%O 0,2
%A _Paul D. Hanna_, Dec 05 2009
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