a(n) = Sum_{k=0..n} k^n * k! * binomial(n,k)^2.

A341185

a(n) = Sum_{k=0..n} k^n * k! * binomial(n,k)^2.

Terms

    a(0) =1a(1) =1a(2) =12a(3) =315a(4) =15088a(5) =1141625a(6) =124989156a(7) =18659050795

External references