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

Terms

a(0) =1a(1) =2a(2) =6a(3) =20a(4) =62a(5) =194a(6) =610a(7) =1914a(8) =6006a(9) =18850a(10) =59158a(11) =185658a(12) =582662a(13) =1828602a(14) =5738806a(15) =18010426a(16) =56523158a(17) =177389882a(18) =556712886a(19) =1747164122a(20) =5483225814a(21) =17208323450a(22) =54005872822a(23) =169489741850a(24) =531919420822