a(n) = binomial(8*n,n)*(6*n+1)/(7*n+1).

A215552

a(n) = binomial(8*n,n)*(6*n+1)/(7*n+1).

Terms

    a(0) =1a(1) =7a(2) =104a(3) =1748a(4) =31000a(5) =566618a(6) =10559208a(7) =199448964a(8) =3804949176a(9) =73143988775

External references