Expansion of (1-x)(1+x)/(1-2*x-3*x^2+2*x^4).

Terms

a(0) =1a(1) =2a(2) =6a(3) =18a(4) =52a(5) =154a(6) =452a(7) =1330a(8) =3912a(9) =11506a(10) =33844a(11) =99546a(12) =292800a(13) =861226a(14) =2533164a(15) =7450914a(16) =21915720a(17) =64461730a(18) =189604292a(19) =557691946a(20) =1640365328a(21) =4824883034a(22) =14191653468a(23) =41742572146a(24) =122779374040a(25) =361136698450