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

Terms

a(0) =1a(1) =2a(2) =5a(3) =15a(4) =44a(5) =126a(6) =357a(7) =1003a(8) =2783a(9) =7618a(10) =20627a(11) =55421a(12) =148021a(13) =393140a(14) =1038123a(15) =2724992a(16) =7112022a(17) =18465708a(18) =47726767a(19) =122861732a(20) =315123476a(21) =805428727a(22) =2051556778a(23) =5207982062a(24) =13177117709a(25) =33235023381a(26) =83574705456a(27) =209576713721a(28) =524181331710