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

Terms

a(0) =1a(1) =3a(2) =8a(3) =19a(4) =44a(5) =100a(6) =226a(7) =509a(8) =1145a(9) =2574a(10) =5785a(11) =13000a(12) =29212a(13) =65640a(14) =147493a(15) =331415a(16) =744684a(17) =1673291a(18) =3759852a(19) =8448312a(20) =18983186a(21) =42654833a(22) =95844541a(23) =215360730a(24) =483911169a(25) =1087338528a(26) =2443227496a(27) =5489882352a(28) =12335653673a(29) =27717962203