a(n) = Sum_{k=0..floor(n/2)} (binomial(n,k) * binomial(n-k,k))^3.
A382842
a(n) = Sum_{k=0..floor(n/2)} (binomial(n,k) * binomial(n-k,k))^3.
Terms
- a(0) =1a(1) =1a(2) =9a(3) =217a(4) =1945a(5) =35001a(6) =764001a(7) =12079089a(8) =250222617a(9) =5424133465a(10) =107360983009
External references
- oeis: A382842