a(n) = ((5+sqrt(5))*(4+sqrt(5))^n + (5-sqrt(5))*(4-sqrt(5))^n)/10.
A163073
a(n) = ((5+sqrt(5))*(4+sqrt(5))^n + (5-sqrt(5))*(4-sqrt(5))^n)/10.
Terms
- a(0) =1a(1) =5a(2) =29a(3) =177a(4) =1097a(5) =6829a(6) =42565a(7) =265401a(8) =1654993a(9) =10320533a(10) =64359341a(11) =401348865a(12) =2502838169a(13) =15607867837a(14) =97331722837a(15) =606967236489
External references
- oeis: A163073