Product t2(q^d); d | 27, 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) =3a(10) =3a(11) =0a(12) =3a(13) =2a(14) =0a(15) =4a(16) =0a(17) =0a(18) =4a(19) =4a(20) =0a(21) =3a(22) =1a(23) =0a(24) =5a(25) =0a(26) =0a(27) =4a(28) =6a(29) =0