a(n) = Sum_{k=1..n} Stirling2(n,k)*(k!)^3.

A263158

a(n) = Sum_{k=1..n} Stirling2(n,k)*(k!)^3.

Terms

    a(0) =1a(1) =9a(2) =241a(3) =15177a(4) =1871761a(5) =400086249a(6) =136109095921

External references