a(n) = ( (4 + sqrt(7))^n - (4 - sqrt(7))^n )/(2*sqrt(7)).
A154245
a(n) = ( (4 + sqrt(7))^n - (4 - sqrt(7))^n )/(2*sqrt(7)).
Terms
- a(0) =1a(1) =8a(2) =55a(3) =368a(4) =2449a(5) =16280a(6) =108199a(7) =719072a(8) =4778785a(9) =31758632a(10) =211059991a(11) =1402652240a(12) =9321678001a(13) =61949553848a(14) =411701328775
External references
- oeis: A154245