a(n) = n! * Sum_{k=1..n} (-1)^(k+1) * n^(n-k) / (n-k)!.
A347993
a(n) = n! * Sum_{k=1..n} (-1)^(k+1) * n^(n-k) / (n-k)!.
Terms
- a(0) =1a(1) =2a(2) =15a(3) =136a(4) =1645a(5) =24336a(6) =426979a(7) =8658560a(8) =199234809a(9) =5128019200a(10) =145969492471
External references
- oeis: A347993