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

Terms

a(0) =1a(1) =3a(2) =9a(3) =25a(4) =69a(5) =189a(6) =517a(7) =1413a(8) =3861a(9) =10549a(10) =28821a(11) =78741a(12) =215125a(13) =587733a(14) =1605717a(15) =4386901a(16) =11985237a(17) =32744277a(18) =89459029a(19) =244406613a(20) =667731285a(21) =1824275797a(22) =4984014165a(23) =13616579925a(24) =37201188181a(25) =101635536213a(26) =277673448789a(27) =758617970005