Wκ,±12⁢n⁡(z)=(-1)κ-12⁢n-12⁢ⅇ-12⁢z⁢z12⁢n+12⁢∑k=0κ-12⁢n-12(κ-12⁢n-12k)⁢(n+1+k)κ-k-12⁢n-12⁢(-z)k,