a(n) = Sum_{d|n} d^(d - n/d) * binomial(d, n/d).
A338693
a(n) = Sum_{d|n} d^(d - n/d) * binomial(d, n/d).
Terms
- a(0) =1a(1) =4a(2) =27a(3) =257a(4) =3125a(5) =46665a(6) =823543a(7) =16777312a(8) =387420490a(9) =10000001250a(10) =285311670611
External references
- oeis: A338693