Expansion of Product_{k>=1} (1 + x^k)^(d(k)-1), where d(k) = number of divisors of k (A000005).

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =2a(6) =5a(7) =4a(8) =8a(9) =10a(10) =15a(11) =17a(12) =29a(13) =31a(14) =48a(15) =60a(16) =81a(17) =99a(18) =143a(19) =167a(20) =231a(21) =287a(22) =374a(23) =460a(24) =615a(25) =740a(26) =964a(27) =1194a(28) =1512a(29) =1856