Product t2(q^d); d | 16, where t2 = theta2(q)/(2*q^(1/4)).

Terms

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