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

Terms

a(0) =1a(1) =3a(2) =9a(3) =28a(4) =87a(5) =271a(6) =844a(7) =2629a(8) =8189a(9) =25508a(10) =79455a(11) =247495a(12) =770924a(13) =2401357a(14) =7480005a(15) =23299524a(16) =72575863a(17) =226067103a(18) =704178124a(19) =2193449749a(20) =6832393165a(21) =21282272996a(22) =66292312655a(23) =206494424631a(24) =643211040556