a(n) = Sum_{k=0..[n/2]} C(n-k,k)^(n-k)*n/(n-k), n>=1.
A166895
a(n) = Sum_{k=0..[n/2]} C(n-k,k)^(n-k)*n/(n-k), n>=1.
Terms
- a(0) =1a(1) =3a(2) =7a(3) =39a(4) =366a(5) =5697a(6) =194881a(7) =16288695a(8) =2430565261a(9) =564615230758
External references
- oeis: A166895