Power ceiling sequence of 2+sqrt(8).

Terms

a(0) =5a(1) =25a(2) =121a(3) =585a(4) =2825a(5) =13641a(6) =65865a(7) =318025a(8) =1535561a(9) =7414345a(10) =35799625a(11) =172855881a(12) =834622025a(13) =4029911625a(14) =19458134601a(15) =93952184905a(16) =453641278025