Second elementary symmetric function of the first n terms of (1,3,9,27,81,...).

A203243

Second elementary symmetric function of the first n terms of (1,3,9,27,81,...).

Terms

    a(0) =3a(1) =39a(2) =390a(3) =3630a(4) =33033a(5) =298389a(6) =2688780a(7) =24208860a(8) =217909263a(9) =1961271939a(10) =17651713170a(11) =158866215690

External references