a(n) = Sum_{k=0..n} binomial(2*n+1,2*k+1)*(n^2-1)^(n-k)*n^(2*k).
A322904
a(n) = Sum_{k=0..n} binomial(2*n+1,2*k+1)*(n^2-1)^(n-k)*n^(2*k).
Terms
- a(0) =1a(1) =1a(2) =181a(3) =38081a(4) =14526601a(5) =8943235489
External references
- oeis: A322904
A322904
a(n) = Sum_{k=0..n} binomial(2*n+1,2*k+1)*(n^2-1)^(n-k)*n^(2*k).