Product t2(q^d); d | 39, where t2 = theta2(q)/(2*q^(1/4)).

Terms

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