a(n) = Sum_{k=0..n} binomial(n+7*k+7,k).
A390391
a(n) = Sum_{k=0..n} binomial(n+7*k+7,k).
Terms
- a(0) =1a(1) =16a(2) =270a(3) =4789a(4) =87530a(5) =1631130a(6) =30809605a(7) =587764866a(8) =11298879823a(9) =218519689068
External references
- oeis: A390391