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%I #2 Mar 30 2012 18:37:21
%S 1,1,4,13,33,97,273,709,1866,5120,13036,33582,87333,219269,555681,
%T 1413270,3488571,8687949,21624643,52958400,130132799,319007916,
%U 773803200,1877699413,4549855097,10950145994,26310132088,63155284600
%N G.f.: exp( Sum_{n>=1} sigma(n*2^(n-1))*x^n/n ).
%F The logarithmic derivative equals A176362.
%o (PARI) {a(n)=polcoeff(exp(sum(k=1,n,sigma(k*2^(k-1))*x^k/k)+x*O(x^n)),n)}
%Y Cf. A176362, A176310, A000203 (sigma).
%K nonn
%O 0,3
%A _Paul D. Hanna_, Apr 15 2010
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