Expansion of 1/(Sum_{k>=0} x^(k^2))^3.

Terms

a(0) =1a(1) =-3a(2) =6a(3) =-10a(4) =12a(5) =-9a(6) =-2a(7) =24a(8) =-54a(9) =80a(10) =-84a(11) =42a(12) =66a(13) =-234a(14) =420a(15) =-536a(16) =450a(17) =-39a(18) =-740a(19) =1770a(20) =-2688a(21) =2898a(22) =-1722a(23) =-1320a(24) =6078a(25) =-11349a(26) =14736a(27) =-12992a(28) =3084a(29) =15999