Expansion of Product_{i >= 1} (1 - q^i)*(1 - q^(7*i)).

Terms

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