Expansion of Sum_{k>=1} (-1 + Product_{j>=1} (1 + x^(k*j))^j).

Terms

a(0) =1a(1) =3a(2) =6a(3) =11a(4) =17a(5) =36a(6) =50a(7) =94a(8) =148a(9) =254a(10) =386a(11) =671a(12) =1005a(13) =1651a(14) =2543a(15) =4034a(16) =6112a(17) =9599a(18) =14410a(19) =22178a(20) =33189a(21) =50196a(22) =74485a(23) =111591a(24) =164149a(25) =242967a(26) =355317a(27) =520817a(28) =755895a(29) =1099219