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

Terms

a(0) =1a(1) =1a(2) =3a(3) =10a(4) =37a(5) =141a(6) =541a(7) =2080a(8) =8001a(9) =30781a(10) =118423a(11) =455610a(12) =1752877a(13) =6743881a(14) =25945881a(15) =99822160a(16) =384048001a(17) =1477556361a(18) =5684635243a(19) =21870622810a(20) =84143330517a(21) =323726495221