a(n) = 6*binomial(11*n+6,n)/(11*n+6).

A234872

a(n) = 6*binomial(11*n+6,n)/(11*n+6).

Terms

    a(0) =1a(1) =6a(2) =81a(3) =1406a(4) =27636a(5) =585162a(6) =13019909a(7) =300138696a(8) =7105216833a(9) =171717015470

External references