%I A122266
%S A122266 1,238,1679,2162,2401,6958,1442,23040,1918,9362,14641,0,80640,20398,
%T A122266 28083,64078,38398,69120,0,90482,58562,0,241920,100558,146879,0,193438,
%U A122266 399602,104638,114002,130321,24242,0,107282,276962,351118
%V A122266 1,238,1679,2162,2401,-6958,-1442,-23040,1918,-9362,14641,0,80640,-20398,
               28083,64078,
%W A122266 -38398,-69120,0,-90482,-58562,0,-241920,100558,146879,0,-193438,399602,
               104638,114002,
%X A122266 130321,24242,0,107282,-276962,351118
%N A122266 Expansion of f(-q)^2*Q(q) in powers of q.
%C A122266 f(-q) (g.f. A010815) and Q(q) (g.f. A004009) are Ramanujan q-series.
%H A122266 S. R. Finch, <a href="http://arXiv.org/abs/math.NT/0701251">Powers of 
               Euler's q-Series</a>, (arXiv:math.NT/0701251).
%o A122266 (PARI) {a(n)=local(A); if(n<0, 0, A=x*O(x^n); polcoeff( eta(x+A)^2*sum(k=1, 
               n, 240*sigma(k,3)*x^k, 1+A), n))}
%Y A122266 Sequence in context: A069420 A129124 A124169 this_sequence A013477 A013473 
               A140032
%Y A122266 Adjacent sequences: A122263 A122264 A122265 this_sequence A122267 A122268 
               A122269
%K A122266 sign
%O A122266 0,2
%A A122266 Michael Somos, Aug 28 2006