Binomial convolution of the binomial coefficients bin(3n,n) (A005809) and bin(3n,n)/(2n+1) (A001764).

A188913

Binomial convolution of the binomial coefficients bin(3n,n) (A005809) and bin(3n,n)/(2n+1) (A001764).

Terms

    a(0) =1a(1) =4a(2) =24a(3) =168a(4) =1300a(5) =10896a(6) =97734a(7) =928752a(8) =9262116a(9) =96091440a(10) =1029267888a(11) =11311712352a(12) =126921365298

External references