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

A390387

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

Terms

    a(0) =1a(1) =9a(2) =130a(3) =2171a(4) =38425a(5) =701712a(6) =13070415a(7) =246807745a(8) =4707467308a(9) =90480226611

External references