a(n) = (1/e) * Sum_{k>=0} ((k+4)!/k!)^(n-1)/k!.
A071379
a(n) = (1/e) * Sum_{k>=0} ((k+4)!/k!)^(n-1)/k!.
Terms
- a(0) =1a(1) =1a(2) =209a(3) =163121a(4) =326922081
External references
- oeis: A071379
A071379
a(n) = (1/e) * Sum_{k>=0} ((k+4)!/k!)^(n-1)/k!.