a(n) = sum of the n-th power of the trinomial coefficients in row n of triangle A027907.

A168591

a(n) = sum of the n-th power of the trinomial coefficients in row n of triangle A027907.

Terms

    a(0) =1a(1) =3a(2) =19a(3) =831a(4) =281907a(5) =764206503

External references