ζ⁡(s)=∑k=1N1ks+N1-ss-1-12⁢N-s+∑k=1n(s+2⁢k-22⁢k-1)⁢B2⁢k2⁢k⁢N1-s-2⁢k-(s+2⁢n2⁢n+1)⁢∫N∞B~2⁢n+1⁡(x)xs+2⁢n+1⁢ⅆ⁡x,