a(n) = (-1)^n * Sum_{k=0..n} (-2)^k * binomial(n,k) * binomial(n^2+k+1,n)/(n^2+k+1).
A336495
a(n) = (-1)^n * Sum_{k=0..n} (-2)^k * binomial(n,k) * binomial(n^2+k+1,n)/(n^2+k+1).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =34a(4) =484a(5) =9946a(6) =270314a(7) =9189776a(8) =376223992a(9) =18046839982a(10) =993655820512
External references
- oeis: A336495