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%I #4 Mar 12 2015 22:51:08
%S 1,7,119,3955,247093,29355725,6770018269,3075928905505,
%T 2774997766597238,4989660046676105752,17913062958150482828608,
%U 128508635121001835101510976,1843071985575998120371392747776
%N G.f. satisfies: A(x) = (1 + x*A(2x))^7.
%F Self-convolution 7th power of A171208 where a(n) = A171208(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))^7); polcoeff(A, n)}
%Y Cf. A135868, A171200-A171207, A171208, A171210-A171211.
%K nonn
%O 0,2
%A _Paul D. Hanna_, Dec 05 2009
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