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

Terms

a(0) =-3a(1) =3a(2) =-13a(3) =18a(4) =-24a(5) =21a(6) =-39a(7) =63a(8) =-68a(9) =48a(10) =-81a(11) =127a(12) =-108a(13) =87a(14) =-170a(15) =216a(16) =-174a(17) =156a(18) =-213a(19) =294a(20) =-302a(21) =201a(22) =-303a(23) =497a(24) =-375a(25) =276a(26) =-474a(27) =537a(28) =-468a(29) =426