a(n) = ((5+sqrt(2))*(4+sqrt(2))^n + (5-sqrt(2))*(4-sqrt(2))^n)/2.
A162271
a(n) = ((5+sqrt(2))*(4+sqrt(2))^n + (5-sqrt(2))*(4-sqrt(2))^n)/2.
Terms
- a(0) =5a(1) =22a(2) =106a(3) =540a(4) =2836a(5) =15128a(6) =81320a(7) =438768a(8) =2371664a(9) =12830560a(10) =69441184a(11) =375901632a(12) =2035036480a(13) =11017668992a(14) =59650841216a(15) =322959363840
External references
- oeis: A162271