Expansion of Product_{k>=0} (1-x^(3*k+1))^(3*k+1).

Terms

a(0) =1a(1) =-1a(2) =0a(3) =0a(4) =-4a(5) =4a(6) =0a(7) =-7a(8) =13a(9) =-6a(10) =-10a(11) =38a(12) =-32a(13) =-9a(14) =74a(15) =-103a(16) =27a(17) =137a(18) =-266a(19) =153a(20) =191a(21) =-593a(22) =537a(23) =167a(24) =-1161a(25) =1437a(26) =-222a(27) =-2035a(28) =3397a(29) =-1578