a(n) = floor(Fibonacci(n)^(1/4)).

Terms

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