Search: id:A136652
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%I A136652
%S A136652 1,3,19,223,4771,190023,14441659,2130394591,616038609331,
%T A136652 351153716973303,395928966997611499,885010943452285951183,
%U A136652 3928049212346654960720611,34658088824057172975437120103
%N A136652 L.g.f.: A(x) = log( Sum_{n>=0} 2^[n(n-1)/2]*x^n ).
%e A136652 L.g.f.: A(x) = x + 3*x^2/2 + 19*x^3/3 + 223*x^4/4 + 4771*x^5/5 +...
%e A136652 A(x) = log(1 + x + 2x^2 + 8x^3 + 64x^4 + 1024x^5 +...+ 2^(n(n-1)/2)*x^n 
               +...).
%o A136652 (PARI) a(n)=n*polcoeff(log(sum(k=0,n,2^(k*(k-1)/2)*x^k +x*O(x^n))),n)
%Y A136652 Cf. A136653, A136654.
%Y A136652 Sequence in context: A001833 A001035 A166380 this_sequence A136504 A003111 
               A126444
%Y A136652 Adjacent sequences: A136649 A136650 A136651 this_sequence A136653 A136654 
               A136655
%K A136652 nonn
%O A136652 1,2
%A A136652 Paul D. Hanna (pauldhanna(AT)juno.com), Jan 15 2008

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