a(n) = Sum_{k=0..n} n^k * binomial(n,k)^4.

A234971

a(n) = Sum_{k=0..n} n^k * binomial(n,k)^4.

Terms

    a(0) =1a(1) =2a(2) =37a(3) =1000a(4) =38401a(5) =1896876a(6) =112124629a(7) =7679202336a(8) =595411451905

External references