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

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =13a(6) =22a(7) =39a(8) =65a(9) =104a(10) =160a(11) =263a(12) =413a(13) =646a(14) =975a(15) =1479a(16) =2198a(17) =3354a(18) =5017a(19) =7389a(20) =10770a(21) =15721a(22) =22668a(23) =32663a(24) =47200a(25) =67761a(26) =96389a(27) =135977a(28) =191431a(29) =268805