Expansion of Product_{j>=1} (1 - x^j)/(1 - x^(3*j))^3.

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =3a(4) =-3a(5) =-2a(6) =9a(7) =-8a(8) =-6a(9) =22a(10) =-19a(11) =-13a(12) =50a(13) =-42a(14) =-29a(15) =104a(16) =-86a(17) =-57a(18) =209a(19) =-170a(20) =-113a(21) =398a(22) =-320a(23) =-208a(24) =737a(25) =-586a(26) =-380a(27) =1320a(28) =-1041a(29) =-666