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

Terms

a(0) =1a(1) =2a(2) =8a(3) =28a(4) =100a(5) =356a(6) =1268a(7) =4516a(8) =16084a(9) =57284a(10) =204020a(11) =726628a(12) =2587924a(13) =9217028a(14) =32826932a(15) =116914852a(16) =416398420a(17) =1483024964a(18) =5281871732a(19) =18811665124a(20) =66998738836a(21) =238619546756a(22) =849856117940