Power floor sequence of 2+sqrt(8).

Terms

a(0) =4a(1) =19a(2) =91a(3) =439a(4) =2119a(5) =10231a(6) =49399a(7) =238519a(8) =1151671a(9) =5560759a(10) =26849719a(11) =129641911a(12) =625966519a(13) =3022433719a(14) =14593600951a(15) =70464138679a(16) =340230958519