a(n) = ((7 + sqrt(8))^n + (7 - sqrt(8))^n)/2.

A147689

a(n) = ((7 + sqrt(8))^n + (7 - sqrt(8))^n)/2.

Terms

    a(0) =1a(1) =7a(2) =57a(3) =511a(4) =4817a(5) =46487a(6) =453321a(7) =4440527a(8) =43581217a(9) =428075431a(10) =4206226137a(11) =41336073247a(12) =406249753841

External references