a(n) = j if n = [ j*sqrt(5) ], else a(n) = k if n = [ (k/4)*(5 + sqrt(5)) ].

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =3a(5) =3a(6) =4a(7) =4a(8) =5a(9) =6a(10) =5a(11) =7a(12) =6a(13) =8a(14) =7a(15) =9a(16) =8a(17) =10a(18) =11a(19) =9a(20) =12a(21) =10a(22) =13a(23) =11a(24) =14a(25) =12a(26) =15a(27) =16a(28) =13a(29) =17