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

Terms

a(0) =1a(1) =3a(2) =7a(3) =16a(4) =36a(5) =80a(6) =177a(7) =391a(8) =863a(9) =1904a(10) =4200a(11) =9264a(12) =20433a(13) =45067a(14) =99399a(15) =219232a(16) =483532a(17) =1066464a(18) =2352161a(19) =5187855a(20) =11442175a(21) =25236512a(22) =55660880a(23) =122763936a(24) =270764385a(25) =597189651a(26) =1317143239a(27) =2905050864a(28) =6407291380a(29) =14131726000