Expansion of Product_{m>=1} (1+q^m)^(-3).

Terms

a(0) =1a(1) =-3a(2) =3a(3) =-4a(4) =9a(5) =-12a(6) =15a(7) =-21a(8) =30a(9) =-43a(10) =54a(11) =-69a(12) =94a(13) =-123a(14) =153a(15) =-193a(16) =252a(17) =-318a(18) =391a(19) =-486a(20) =609a(21) =-754a(22) =918a(23) =-1119a(24) =1376a(25) =-1680a(26) =2019a(27) =-2432a(28) =2946a(29) =-3540