Expansion of x*(1+x) / (1-3*x^2-x^3).

Terms

a(0) =0a(1) =1a(2) =1a(3) =3a(4) =4a(5) =10a(6) =15a(7) =34a(8) =55a(9) =117a(10) =199a(11) =406a(12) =714a(13) =1417a(14) =2548a(15) =4965a(16) =9061a(17) =17443a(18) =32148a(19) =61390a(20) =113887a(21) =216318a(22) =403051a(23) =762841a(24) =1425471a(25) =2691574a(26) =5039254a(27) =9500193a(28) =17809336a(29) =33539833