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

Terms

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