a(n) = 3^n * [x^n] Product_{k>=1} ((1 + 3*x^k)/(1 - 3*x^k))^(1/3).
A370752
a(n) = 3^n * [x^n] Product_{k>=1} ((1 + 3*x^k)/(1 - 3*x^k))^(1/3).
Terms
- a(0) =1a(1) =6a(2) =36a(3) =360a(4) =1998a(5) =18792a(6) =121176a(7) =1123632a(8) =7537860a(9) =72078174a(10) =510702408a(11) =4896308088a(12) =35923749480a(13) =345406994280
External references
- oeis: A370752