a(n) = (1/n) * Sum_{d|n} moebius(n/d) * Lucas(d)^(d-1), where Lucas(n) = A000032(n).
A203800
a(n) = (1/n) * Sum_{d|n} moebius(n/d) * Lucas(d)^(d-1), where Lucas(n) = A000032(n).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =85a(4) =2928a(5) =314925a(6) =84974760a(7) =63327890015
External references
- oeis: A203800