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

A233736

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

Terms

    a(0) =1a(1) =8a(2) =68a(3) =616a(4) =5850a(5) =57536a(6) =581196a(7) =5995184a(8) =62891499a(9) =668922800a(10) =7197169980a(11) =78195588168a(12) =856708896784

External references