Product t2(q^d); d | 40, where t2 = theta2(q)/(2*q^(1/4)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =3a(6) =4a(7) =4a(8) =4a(9) =4a(10) =7a(11) =7a(12) =10a(13) =9a(14) =9a(15) =15a(16) =13a(17) =16a(18) =17a(19) =14a(20) =24a(21) =23a(22) =23a(23) =23a(24) =26a(25) =36a(26) =31a(27) =40a(28) =34a(29) =38