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

Terms

a(0) =1a(1) =3a(2) =9a(3) =26a(4) =74a(5) =210a(6) =595a(7) =1685a(8) =4771a(9) =13508a(10) =38244a(11) =108276a(12) =306549a(13) =867895a(14) =2457165a(15) =6956670a(16) =19695566a(17) =55761638a(18) =157871079a(19) =446961001a(20) =1265425799a(21) =3582644680a(22) =10143101960a(23) =28716919080a(24) =81302686761a(25) =230182313643a(26) =651686919889