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

Terms

a(0) =1a(1) =0a(2) =1a(3) =3a(4) =4a(5) =9a(6) =19a(7) =36a(8) =73a(9) =147a(10) =292a(11) =585a(12) =1171a(13) =2340a(14) =4681a(15) =9363a(16) =18724a(17) =37449a(18) =74899a(19) =149796a(20) =299593a(21) =599187a(22) =1198372a(23) =2396745a(24) =4793491a(25) =9586980a(26) =19173961a(27) =38347923a(28) =76695844a(29) =153391689