a(n) = ((2+sqrt(2))*(5+sqrt(2))^n+(2-sqrt(2))*(5-sqrt(2))^n)/4.
A161734
a(n) = ((2+sqrt(2))*(5+sqrt(2))^n+(2-sqrt(2))*(5-sqrt(2))^n)/4.
Terms
- a(0) =1a(1) =6a(2) =37a(3) =232a(4) =1469a(5) =9354a(6) =59753a(7) =382388a(8) =2449561a(9) =15700686a(10) =100666957a(11) =645553792a(12) =4140197909a(13) =26554241874a(14) =170317866833
External references
- oeis: A161734