M000000206

$$\pi=166406742\arctan\left(\frac{1}{152087733}\right)+31013246\arctan\left(\frac{2}{322564791}\right)+53564820\arctan\left(\frac{1}{168623905}\right)+171972550\arctan\left(\frac{1}{201229582}\right)+100382192\arctan\left(\frac{1}{284862638}\right)+108821360\arctan\left(\frac{2}{604534317}\right)-19196406\arctan\left(\frac{1}{546365045}\right)-29427040\arctan\left(\frac{1}{2189376182}\right)+71579408\arctan\left(\frac{1}{3261365450}\right)+96486624\arctan\left(\frac{2}{11352069609}\right)-122211084\arctan\left(\frac{1}{7427844818}\right)+42576636\arctan\left(\frac{1}{27354282288}\right)-205420822\arctan\left(\frac{2}{108928448489}\right)-31064620\arctan\left(\frac{1}{71617196968}\right)-129909656\arctan\left(\frac{1}{164432798314}\right)+3695322\arctan\left(\frac{1}{4963640229982}\right)-118648528\arctan\left(\frac{1}{169838669284032}\right)$$