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

A234467

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

Terms

    a(0) =1a(1) =9a(2) =108a(3) =1488a(4) =22230a(5) =350244a(6) =5729724a(7) =96395616a(8) =1657248417a(9) =28987537150a(10) =514215324216

External references