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

Terms

a(0) =2a(1) =3a(2) =11a(3) =26a(4) =71a(5) =183a(6) =482a(7) =1259a(8) =3299a(9) =8634a(10) =22607a(11) =59183a(12) =154946a(13) =405651a(14) =1062011a(15) =2780378a(16) =7279127a(17) =19056999a(18) =49891874a(19) =130618619a(20) =341963987a(21) =895273338a(22) =2343856031a(23) =6136294751a(24) =16065028226a(25) =42058789923a(26) =110111341547