Binomial convolution of the binomial coefficients bin(3n,n) (A005809).

A188911

Binomial convolution of the binomial coefficients bin(3n,n) (A005809).

Terms

    a(0) =1a(1) =6a(2) =48a(3) =438a(4) =4356a(5) =46056a(6) =509106a(7) =5814738a(8) =68050116a(9) =811240872a(10) =9810384048a(11) =119990105208

External references