Revert transform of x*(1 - 3*x + x^2)/(1 - 2*x - x^2).

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =89a(6) =380a(7) =1679a(8) =7602a(9) =35072a(10) =164266a(11) =779022a(12) =3733444a(13) =18053457a(14) =87977300a(15) =431628390a(16) =2130222854a(17) =10568712275a(18) =52681070700a(19) =263702193164