a(n) = Sum_{k=0..n} binomial(5*n+k,n-k).
A390332
a(n) = Sum_{k=0..n} binomial(5*n+k,n-k).
Terms
- a(0) =1a(1) =6a(2) =57a(3) =593a(4) =6430a(5) =71413a(6) =805699a(7) =9191985a(8) =105746033a(9) =1224418350a(10) =14250975939a(11) =166571639207
External references
- oeis: A390332