a(n) = Sum_{k=0..n} binomial(n,k) * binomial(7*k,k) / (6*k + 1).

A346649

a(n) = Sum_{k=0..n} binomial(n,k) * binomial(7*k,k) / (6*k + 1).

Terms

    a(0) =1a(1) =2a(2) =10a(3) =95a(4) =1146a(5) =15343a(6) =218407a(7) =3241316a(8) =49588850a(9) =776483636a(10) =12383420161a(11) =200444399493

External references