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

Terms

a(0) =0a(1) =3a(2) =10a(3) =36a(4) =118a(5) =393a(6) =1297a(7) =4287a(8) =14158a(9) =46764a(10) =154450a(11) =510117a(12) =1684801a(13) =5564523a(14) =18378370a(15) =60699636a(16) =200477278a(17) =662131473a(18) =2186871697a(19) =7222746567a(20) =23855111398a(21) =78788080764a(22) =260219353690a(23) =859446141837