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

Terms

a(0) =1a(1) =2a(2) =6a(3) =16a(4) =38a(5) =88a(6) =200a(7) =428a(8) =902a(9) =1874a(10) =3780a(11) =7504a(12) =14732a(13) =28368a(14) =54052a(15) =101960a(16) =189750a(17) =349996a(18) =640218a(19) =1159624a(20) =2084952a(21) =3722008a(22) =6593560a(23) =11606268a(24) =20308188a(25) =35312170a(26) =61065636a(27) =105060200a(28) =179795936a(29) =306244136