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

A336828

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

Terms

    a(0) =1a(1) =1a(2) =8a(3) =108a(4) =2144a(5) =56250a(6) =1836792a(7) =71799504a(8) =3269445888a(9) =169974711630

External references