a(n) = Sum_{k=0..n} (k!)^2 * binomial(k+2,2) * Stirling1(n,k)^2.
A382806
a(n) = Sum_{k=0..n} (k!)^2 * binomial(k+2,2) * Stirling1(n,k)^2.
Terms
- a(0) =1a(1) =3a(2) =27a(3) =588a(4) =24612a(5) =1669128a(6) =165049224a(7) =22269896064
External references
- oeis: A382806