Sum_{k=0..n} k^(n-k)*(n+k)^k.

A252710

Sum_{k=0..n} k^(n-k)*(n+k)^k.

Terms

    a(0) =2a(1) =19a(2) =270a(3) =5274a(4) =131250a(5) =3971953a(6) =141615782a(7) =5814096100a(8) =270145723914

External references