a(n) = Sum_{k=0..n-1} binomial(5*k+1,k) * binomial(5*n-5*k,n-k-1).
A386614
a(n) = Sum_{k=0..n-1} binomial(5*k+1,k) * binomial(5*n-5*k,n-k-1).
Terms
- a(0) =0a(1) =1a(2) =16a(3) =220a(4) =2880a(5) =36850a(6) =465536a(7) =5834852a(8) =72744640a(9) =903525715a(10) =11191199200a(11) =138323478980
External references
- oeis: A386614