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

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =-2a(5) =1a(6) =-1a(7) =1a(8) =-7a(9) =10a(10) =0a(11) =4a(12) =-31a(13) =31a(14) =8a(15) =53a(16) =-163a(17) =108a(18) =-74a(19) =212a(20) =-450a(21) =732a(22) =-353a(23) =467a(24) =-3412a(25) =3614a(26) =-145a(27) =5613a(28) =-11910a(29) =8816