a(n) = 1*3^(3*n) + 2*3^(2*n) - 3*3^(1*n).
A122038
a(n) = 1*3^(3*n) + 2*3^(2*n) - 3*3^(1*n).
Terms
- a(0) =36a(1) =864a(2) =21060a(3) =544320a(4) =14466276a(5) =388481184a(6) =10469912580a(7) =282515610240
External references
- oeis: A122038
A122038
a(n) = 1*3^(3*n) + 2*3^(2*n) - 3*3^(1*n).