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

Terms

a(0) =1a(1) =3a(2) =9a(3) =28a(4) =88a(5) =277a(6) =872a(7) =2745a(8) =8641a(9) =27201a(10) =85626a(11) =269542a(12) =848491a(13) =2670964a(14) =8407925a(15) =26467299a(16) =83316385a(17) =262271568a(18) =825604416a(19) =2598919345a(20) =8181135700a(21) =25753389181a(22) =81069068969a(23) =255197244033a(24) =803335158406