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

Terms

a(0) =1a(1) =3a(2) =9a(3) =29a(4) =93a(5) =299a(6) =961a(7) =3089a(8) =9929a(9) =31915a(10) =102585a(11) =329741a(12) =1059893a(13) =3406835a(14) =10950657a(15) =35198913a(16) =113140561a(17) =363669939a(18) =1168951465a(19) =3757383773a(20) =12077432845a(21) =38820730843a(22) =124782241601a(23) =401090022801