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

Terms

a(0) =1a(1) =0a(2) =2a(3) =3a(4) =7a(5) =15a(6) =32a(7) =69a(8) =148a(9) =318a(10) =683a(11) =1467a(12) =3151a(13) =6768a(14) =14537a(15) =31224a(16) =67066a(17) =144051a(18) =309407a(19) =664575a(20) =1427440a(21) =3065997a(22) =6585452a(23) =14144886a(24) =30381787a(25) =65257011a(26) =140165471a(27) =301061280a(28) =646649233a(29) =1388937264