a(n) = 8*binomial(9*n+8,n)/(9*n+8).

A234513

a(n) = 8*binomial(9*n+8,n)/(9*n+8).

Terms

    a(0) =1a(1) =8a(2) =100a(3) =1496a(4) =24682a(5) =433160a(6) =7932196a(7) =149846840a(8) =2898753715a(9) =57135036024

External references