a(n) = Sum_{k=0..n} (n-i)^k * (n+i)^(n-k) * binomial(n,k)^2, where i is the imaginary unit.
A387430
a(n) = Sum_{k=0..n} (n-i)^k * (n+i)^(n-k) * binomial(n,k)^2, where i is the imaginary unit.
Terms
- a(0) =1a(1) =2a(2) =26a(3) =576a(4) =18886a(5) =822800a(6) =44758244a(7) =2920443904a(8) =222277449286
External references
- oeis: A387430