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

A336212

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

Terms

    a(0) =1a(1) =4a(2) =22a(3) =352a(4) =19426a(5) =3862744a(6) =2764634356

External references