a(n) = Sum_{k=0..n} (-n)^(n-k) * (n+k+1) * binomial(n,k) * binomial(n+k,k).
A331513
a(n) = Sum_{k=0..n} (-n)^(n-k) * (n+k+1) * binomial(n,k) * binomial(n+k,k).
Terms
- a(0) =1a(1) =4a(2) =-6a(3) =32a(4) =-170a(5) =-228a(6) =43764a(7) =-1498880a(8) =43826598a(9) =-1249865260a(10) =35978752876
External references
- oeis: A331513