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

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =15a(5) =40a(6) =103a(7) =266a(8) =683a(9) =1753a(10) =4481a(11) =11417a(12) =28993a(13) =73414a(14) =185424a(15) =467302a(16) =1175322a(17) =2950467a(18) =7393090a(19) =18492029a(20) =46173538a(21) =115102596a(22) =286482967a(23) =711990108a(24) =1767048214a(25) =4379814978a(26) =10842382074a(27) =26808912074a(28) =66212421302a(29) =163351562975