Sum of powers of roots of x^3 - x^2 - x - 3.

Terms

a(0) =3a(1) =1a(2) =3a(3) =13a(4) =19a(5) =41a(6) =99a(7) =197a(8) =419a(9) =913a(10) =1923a(11) =4093a(12) =8755a(13) =18617a(14) =39651a(15) =84533a(16) =180035a(17) =383521a(18) =817155a(19) =1740781a(20) =3708499a(21) =7900745a(22) =16831587a(23) =35857829a(24) =76391651a(25) =162744241a(26) =346709379a(27) =738628573a(28) =1573570675a(29) =3352327385