Expansion of (3 -4*x -3*x^2)/((1-x^2)*(1-2*x-x^2)); a Pellian-related sequence.

Terms

a(0) =3a(1) =2a(2) =7a(3) =12a(4) =31a(5) =70a(6) =171a(7) =408a(8) =987a(9) =2378a(10) =5743a(11) =13860a(12) =33463a(13) =80782a(14) =195027a(15) =470832a(16) =1136691a(17) =2744210a(18) =6625111a(19) =15994428a(20) =38613967a(21) =93222358a(22) =225058683a(23) =543339720a(24) =1311738123a(25) =3166815962a(26) =7645370047a(27) =18457556052a(28) =44560482151a(29) =107578520350