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

Terms

a(0) =1a(1) =3a(2) =9a(3) =26a(4) =77a(5) =225a(6) =662a(7) =1941a(8) =5701a(9) =16730a(10) =49117a(11) =144169a(12) =423214a(13) =1242293a(14) =3646701a(15) =10704594a(16) =31422685a(17) =92239057a(18) =270761670a(19) =794802325a(20) =2333088789a(21) =6848623754a(22) =20103672349a(23) =59012968697a(24) =173228577950a(25) =508500766133