a(n) = n! * Sum_{k=0..n} (-k)^(n-k) * (n-k)^k/k!.
A351780
a(n) = n! * Sum_{k=0..n} (-k)^(n-k) * (n-k)^k/k!.
Terms
- a(0) =1a(1) =0a(2) =-2a(3) =6a(4) =108a(5) =-2420a(6) =8730a(7) =1313718a(8) =-57930152a(9) =567983736a(10) =109544982390
External references
- oeis: A351780