Integer nearest (1/n)*(r^n), where r = golden ratio = (1 + sqrt(5))/2.

Terms

a(0) =2a(1) =1a(2) =1a(3) =2a(4) =2a(5) =3a(6) =4a(7) =6a(8) =8a(9) =12a(10) =18a(11) =27a(12) =40a(13) =60a(14) =91a(15) =138a(16) =210a(17) =321a(18) =492a(19) =756a(20) =1166a(21) =1800a(22) =2786a(23) =4320a(24) =6710a(25) =10440a(26) =16267a(27) =25380a(28) =39650a(29) =62017