A171207 - OEIS

%I #4 Mar 13 2015 00:52:54

%S 1,6,87,2468,131799,13400550,2646848041,1030386755856,796631252763576,

%T 1227659952939056640,3777547269650299331856,

%U 23228194648169000672639616,285544368619000766118426358016,7018967175754802830514246125923840

%N G.f. satisfies: A(x) = (1 + x*A(2x))^6.

%F Self-convolution 6th power of A171206 where a(n) = A171206(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))^6); polcoeff(A, n)}

%Y Cf. A135868, A171200-A171205, A171206, A171208-A171211.

%K nonn

%O 0,2

%A _Paul D. Hanna_, Dec 05 2009