Expansion of Product_{m>=1} (1+x^m)^19.

Terms

a(0) =1a(1) =19a(2) =190a(3) =1349a(4) =7676a(5) =37278a(6) =160417a(7) =626924a(8) =2263698a(9) =7647652a(10) =24405633a(11) =74120672a(12) =215505334a(13) =602763220a(14) =1628328880a(15) =4262845643a(16) =10845598563a(17) =26882001287a(18) =65048680364a(19) =153950675585a(20) =356936640088a(21) =811869015895