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

A135749

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

Terms

    a(0) =1a(1) =1a(2) =3a(3) =19a(4) =217a(5) =3821a(6) =95761a(7) =3214975a(8) =137501505a(9) =7226764921a(10) =455941716481

External references