ζ′⁡(-2,a)-112⁢a+19⁢a3-(16⁢a-12⁢a2+13⁢a3)⁢ln⁡a∼∑k=1∞2⁢B2⁢k+2(2⁢k+2)⁢(2⁢k+1)⁢2⁢k⁢(2⁢k-1)⁢a-(2⁢k-1).