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

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =17a(5) =28a(6) =66a(7) =116a(8) =248a(9) =441a(10) =867a(11) =1516a(12) =2894a(13) =5015a(14) =9138a(15) =15724a(16) =27954a(17) =47428a(18) =82421a(19) =138380a(20) =235910a(21) =392040a(22) =657590a(23) =1081225a(24) =1789550a(25) =2914500a(26) =4763562a(27) =7689071a(28) =12433581a(29) =19897139