a(n) = Sum_{k=0..n} (k!)^2 * binomial(k+2,2) * Stirling2(n,k)^2.
A382738
a(n) = Sum_{k=0..n} (k!)^2 * binomial(k+2,2) * Stirling2(n,k)^2.
Terms
- a(0) =1a(1) =3a(2) =27a(3) =579a(4) =22779a(5) =1396803a(6) =121998267a(7) =14333812419
External references
- oeis: A382738