Expansion of exp( Sum_{n>=1} sigma(9*n)*x^n/n ) in powers of x.

Terms

a(0) =1a(1) =13a(2) =104a(3) =633a(4) =3224a(5) =14404a(6) =58151a(7) =216294a(8) =751582a(9) =2464860a(10) =7689669a(11) =22961822a(12) =65955677a(13) =182985947a(14) =492016590a(15) =1285829996a(16) =3274100475a(17) =8139933477a(18) =19795490575a(19) =47165634583a(20) =110259083454a(21) =253208634687a(22) =571880965638