G.f.: (3+x+x^2+2*x^3)/(1-x^2-x^4).

Terms

a(0) =3a(1) =1a(2) =4a(3) =3a(4) =7a(5) =4a(6) =11a(7) =7a(8) =18a(9) =11a(10) =29a(11) =18a(12) =47a(13) =29a(14) =76a(15) =47a(16) =123a(17) =76a(18) =199a(19) =123a(20) =322a(21) =199a(22) =521a(23) =322a(24) =843a(25) =521a(26) =1364a(27) =843a(28) =2207a(29) =1364