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

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =9a(5) =18a(6) =37a(7) =73a(8) =146a(9) =293a(10) =585a(11) =1170a(12) =2341a(13) =4681a(14) =9362a(15) =18725a(16) =37449a(17) =74898a(18) =149797a(19) =299593a(20) =599186a(21) =1198373a(22) =2396745a(23) =4793490a(24) =9586981a(25) =19173961a(26) =38347922a(27) =76695845a(28) =153391689a(29) =306783378