a(n) = ((3+2*sqrt(2))*(5+sqrt(2))^n + (3-2*sqrt(2))*(5-sqrt(2))^n)/2.
A163605
a(n) = ((3+2*sqrt(2))*(5+sqrt(2))^n + (3-2*sqrt(2))*(5-sqrt(2))^n)/2.
Terms
- a(0) =3a(1) =19a(2) =121a(3) =773a(4) =4947a(5) =31691a(6) =203129a(7) =1302397a(8) =8352003a(9) =53564899a(10) =343552921a(11) =2203536533a(12) =14133648147a(13) =90655141211a(14) =581477504729
External references
- oeis: A163605