a(n) = [q^n] Product_{d | n} theta_3(q^d), where theta_3() is the Jacobi theta function.

Terms

a(0) =1a(1) =2a(2) =2a(3) =2a(4) =4a(5) =2a(6) =14a(7) =2a(8) =8a(9) =4a(10) =2a(11) =2a(12) =56a(13) =2a(14) =2a(15) =2a(16) =26a(17) =2a(18) =104a(19) =2a(20) =60a(21) =6a(22) =14a(23) =2a(24) =452a(25) =4a(26) =2a(27) =4a(28) =68a(29) =2