Expansion of (1-3x+5x^2-x^3)/(1-3x+x^2)^2.

Terms

a(0) =1a(1) =3a(2) =12a(3) =44a(4) =149a(5) =479a(6) =1487a(7) =4503a(8) =13386a(9) =39226a(10) =113641a(11) =326173a(12) =928957a(13) =2628459a(14) =7395624a(15) =20708264a(16) =57739517a(17) =160391483a(18) =444068171a(19) =1225831551a(20) =3374848806a(21) =9268963318a(22) =25401364177a(23) =69472849849a(24) =189661024249a(25) =516904018899