The acceleration formula for Zeta(, 2, ) is


                                 3
          1               (x + 1)              21 x + 13
      [--------, [[----------------------]], [-----------], 0.01562500000]
              2                         2     8 (2 x + 1)
       (z + 1)     8 (2 x + 1) (2 x + 3)

                         The error in using 30 terms is

-0.3343737970446460912796691139964154932428091881891989008241668484695012330\
    9613394414567090770963931570659434576646834817662842065893578760319432

      -56
    10