a(n) = ((2+sqrt(5))*(4+sqrt(5))^n + (2-sqrt(5))*(4-sqrt(5))^n)/2.
A162772
a(n) = ((2+sqrt(5))*(4+sqrt(5))^n + (2-sqrt(5))*(4-sqrt(5))^n)/2.
Terms
- a(0) =2a(1) =13a(2) =82a(3) =513a(4) =3202a(5) =19973a(6) =124562a(7) =776793a(8) =4844162a(9) =30208573a(10) =188382802a(11) =1174768113a(12) =7325934082a(13) =45685023413a(14) =284894912402
External references
- oeis: A162772