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

Terms

a(0) =1a(1) =2a(2) =6a(3) =13a(4) =32a(5) =75a(6) =178a(7) =422a(8) =999a(9) =2368a(10) =5609a(11) =13290a(12) =31486a(13) =74597a(14) =176736a(15) =418723a(16) =992042a(17) =2350350a(18) =5568463a(19) =13192832a(20) =31256529a(21) =74053138a(22) =175447094a(23) =415670205a(24) =984808096a(25) =2333212667a(26) =5527860066a(27) =13096635958a(28) =31028620727a(29) =73513176000