a(n) = Sum_{k=0..n} k^(3*n) * k! * StirlingS2(n,k).

A242229

a(n) = Sum_{k=0..n} k^(3*n) * k! * StirlingS2(n,k).

Terms

    a(0) =1a(1) =1a(2) =129a(3) =121171a(4) =421842405

External references