a(n) = (n!)^n * Sum_{k=0..n} 1 / ((k!)^n * (n-k)!).
A336249
a(n) = (n!)^n * Sum_{k=0..n} 1 / ((k!)^n * (n-k)!).
Terms
- a(0) =1a(1) =2a(2) =7a(3) =172a(4) =79745a(5) =1375363126
External references
- oeis: A336249
A336249
a(n) = (n!)^n * Sum_{k=0..n} 1 / ((k!)^n * (n-k)!).