Expansion of x * (d/dx) Sum_{k>=0} k!*x^(k*(k+1)/2)/Product_{j=1..k} (1 - x^j).

Terms

a(0) =0a(1) =1a(2) =2a(3) =9a(4) =12a(5) =25a(6) =66a(7) =91a(8) =152a(9) =243a(10) =570a(11) =715a(12) =1212a(13) =1729a(14) =2702a(15) =5265a(16) =6960a(17) =10489a(18) =15318a(19) =22363a(20) =31100a(21) =57771a(22) =72534a(23) =109411a(24) =151032a(25) =219025a(26) =293930a(27) =421281a(28) =680820a(29) =883369