a(n) = 5^n - ( (sqrt(5)*phi)^n + (sqrt(5)/phi)^n ) + 1, where phi = golden ratio A001622.
A245561
a(n) = 5^n - ( (sqrt(5)*phi)^n + (sqrt(5)/phi)^n ) + 1, where phi = golden ratio A001622.
Terms
- a(0) =0a(1) =1a(2) =11a(3) =76a(4) =451a(5) =2501a(6) =13376a(7) =70001a(8) =361251a(9) =1846876a(10) =9381251a(11) =47437501a(12) =239109376a(13) =1202500001a(14) =6037656251a(15) =30279296876a(16) =151725781251a(17) =759820312501
External references
- oeis: A245561