Sum of n-th powers of the three roots of x^3-2*x^2-x+1.

Terms

a(0) =3a(1) =2a(2) =6a(3) =11a(4) =26a(5) =57a(6) =129a(7) =289a(8) =650a(9) =1460a(10) =3281a(11) =7372a(12) =16565a(13) =37221a(14) =83635a(15) =187926a(16) =422266a(17) =948823a(18) =2131986a(19) =4790529a(20) =10764221a(21) =24186985a(22) =54347662a(23) =122118088a(24) =274396853a(25) =616564132a(26) =1385407029a(27) =3112981337a(28) =6994805571a(29) =15717185450