a(n) = Sum_{k=0..n} n^k * binomial(n,k)^3.

A241247

a(n) = Sum_{k=0..n} n^k * binomial(n,k)^3.

Terms

    a(0) =2a(1) =21a(2) =352a(3) =8065a(4) =231876a(5) =7951069a(6) =314931968a(7) =14095941633a(8) =701590424500

External references