ψn⁡(β)=1(2⁢π)n⁢∫[-π,π]nⅇ-β⁢W⁢ⅆ⁡θ1⁢⋯⁢ⅆ⁡θn=Γ⁡(1+12⁢n⁢β)⁢(Γ⁡(1+12⁢β))-n.