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

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =13a(5) =31a(6) =77a(7) =188a(8) =458a(9) =1113a(10) =2693a(11) =6494a(12) =15614a(13) =37441a(14) =89563a(15) =213771a(16) =509166a(17) =1210327a(18) =2871563a(19) =6800559a(20) =16077631a(21) =37948242a(22) =89432015a(23) =210456759a(24) =494577391a(25) =1160743593a(26) =2720787358a(27) =6369890095a(28) =14895975508a(29) =34795635421