a(n) = 3^(n^2+n) * C(2*n-1 + 1/3^n, n) / (n*3^n + 1).
A159319
a(n) = 3^(n^2+n) * C(2*n-1 + 1/3^n, n) / (n*3^n + 1).
Terms
- a(0) =1a(1) =3a(2) =126a(3) =66708a(4) =379033074
External references
- oeis: A159319
A159319
a(n) = 3^(n^2+n) * C(2*n-1 + 1/3^n, n) / (n*3^n + 1).