E.g.f.: exp(-Sum_{n>=1} sigma_2(n) * x^n).

A294404

E.g.f.: exp(-Sum_{n>=1} sigma_2(n) * x^n).

Terms

    a(0) =1a(1) =-1a(2) =-9a(3) =-31a(4) =-23a(5) =3399a(6) =41311a(7) =473129a(8) =1284081a(9) =-79051537a(10) =-2447228249a(11) =-52444297071a(12) =-712806368999

External references