a(n) = a(n-2) + a(n-3) for n >= 3, with a(0) = a(1) = 2, a(2) = 1.

Terms

a(0) =2a(1) =2a(2) =1a(3) =4a(4) =3a(5) =5a(6) =7a(7) =8a(8) =12a(9) =15a(10) =20a(11) =27a(12) =35a(13) =47a(14) =62a(15) =82a(16) =109a(17) =144a(18) =191a(19) =253a(20) =335a(21) =444a(22) =588a(23) =779a(24) =1032a(25) =1367a(26) =1811a(27) =2399a(28) =3178a(29) =4210