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