Expansion of Product_{k>=1} (1 + x^(6*k))/(1 + x^k).

Terms

a(0) =1a(1) =-1a(2) =0a(3) =-1a(4) =1a(5) =-1a(6) =2a(7) =-2a(8) =2a(9) =-3a(10) =3a(11) =-3a(12) =5a(13) =-5a(14) =5a(15) =-7a(16) =8a(17) =-8a(18) =11a(19) =-12a(20) =12a(21) =-16a(22) =17a(23) =-18a(24) =23a(25) =-25a(26) =26a(27) =-32a(28) =35a(29) =-37