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

Terms

a(0) =1a(1) =1a(2) =4a(3) =14a(4) =48a(5) =161a(6) =535a(7) =1759a(8) =5742a(9) =18619a(10) =60030a(11) =192526a(12) =614537a(13) =1953064a(14) =6182342a(15) =19497895a(16) =61282168a(17) =191995744a(18) =599721399a(19) =1868049926a(20) =5803381167a(21) =17984273654a(22) =55601057973a(23) =171516227866a(24) =527968915206