Expansion of Product_{d | 21} theta_3(q^d).

Terms

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