a(n) = binomial(6*n + 5, 3*n + 1)/(6*n + 5).

A265101

a(n) = binomial(6*n + 5, 3*n + 1)/(6*n + 5).

Terms

    a(0) =1a(1) =30a(2) =1144a(3) =49742a(4) =2340135a(5) =115997970a(6) =5967382200a(7) =315614844558

External references