a(n) = Sum_{k=0..n} 2^k * binomial(n,k) * binomial(n^2+k+1,n)/(n^2+k+1).
A336577
a(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) =3a(2) =24a(3) =498a(4) =18708a(5) =1055838a(6) =80682414a(7) =7829287392a(8) =924359573112
External references
- oeis: A336577