a(n) = 5*binomial(8*n+5, n)/(8*n+5).

A234464

a(n) = 5*binomial(8*n+5, n)/(8*n+5).

Terms

    a(0) =1a(1) =5a(2) =50a(3) =630a(4) =8925a(5) =135751a(6) =2165800a(7) =35759900a(8) =605902440a(9) =10475490875a(10) =184068392508

External references