Product t2(q^d); d | 12, where t2 = theta2(q)/(2*q^(1/4)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =2a(5) =3a(6) =6a(7) =5a(8) =4a(9) =9a(10) =9a(11) =6a(12) =15a(13) =12a(14) =9a(15) =21a(16) =19a(17) =12a(18) =26a(19) =24a(20) =18a(21) =39a(22) =31a(23) =24a(24) =46a(25) =41a(26) =28a(27) =57a(28) =47a(29) =30