a(n) = (n-1)! * Sum_{d|n} 1/((d-1)! * (n/d)!^(d-1)).
A370608
a(n) = (n-1)! * Sum_{d|n} 1/((d-1)! * (n/d)!^(d-1)).
Terms
- a(0) =1a(1) =2a(2) =3a(3) =10a(4) =25a(5) =156a(6) =721a(7) =5356a(8) =40881a(9) =366850a(10) =3628801a(11) =40048086a(12) =479001601a(13) =6228391456a(14) =87184121025
External references
- oeis: A370608