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

A345876

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

Terms

    a(0) =1a(1) =1a(2) =8a(3) =90a(4) =1408a(5) =28350a(6) =697344a(7) =20264244a(8) =679313408a(9) =25805186550

External references