a(n) = (1/n) * Sum_{d|n} moebius(n/d) * Lucas(d)^4, where Lucas(n) = A000204(n).
A203855
a(n) = (1/n) * Sum_{d|n} moebius(n/d) * Lucas(d)^4, where Lucas(n) = A000204(n).
Terms
- a(0) =1a(1) =40a(2) =85a(3) =580a(4) =2928a(5) =17440a(6) =101040a(7) =609660a(8) =3706880a(9) =22887192a(10) =142567200a(11) =895855380a(12) =5667708960a(13) =36072949560a(14) =230763023408
External references
- oeis: A203855