a(n) = Sum_{k=0..n} binomial(n,k) * binomial(8*k,k) / (7*k + 1).

A346650

a(n) = Sum_{k=0..n} binomial(n,k) * binomial(8*k,k) / (7*k + 1).

Terms

    a(0) =1a(1) =2a(2) =11a(3) =120a(4) =1661a(5) =25484a(6) =415619a(7) =7066670a(8) =123865313a(9) =2222178999a(10) =40604688117a(11) =753051711707

External references