a(n) = n! * Sum_{k=0..n} k^(k * (n-k)) / (n-k)!.
A358688
a(n) = n! * Sum_{k=0..n} k^(k * (n-k)) / (n-k)!.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =34a(4) =869a(5) =75866a(6) =28213327a(7) =39049033346
External references
- oeis: A358688
A358688
a(n) = n! * Sum_{k=0..n} k^(k * (n-k)) / (n-k)!.