a(n) = Sum_{k=0..floor(n/2)} n^(3*(n-2*k)) * binomial(n-k,k).
A368890
a(n) = Sum_{k=0..floor(n/2)} n^(3*(n-2*k)) * binomial(n-k,k).
Terms
- a(0) =1a(1) =1a(2) =65a(3) =19737a(4) =16789505a(5) =30525391000
External references
- oeis: A368890
A368890
a(n) = Sum_{k=0..floor(n/2)} n^(3*(n-2*k)) * binomial(n-k,k).