M000000211

$$\pi=\frac{453957268}{3}\arctan\left(\frac{1}{127120947}\right)+\frac{139836916}{3}\arctan\left(\frac{2}{322564791}\right)+\frac{517783072}{3}\arctan\left(\frac{1}{201229582}\right)\frac{-103840088}{3}\arctan\left(\frac{1}{274576229}\right)+\frac{461579620}{3}\arctan\left(\frac{1}{284862638}\right)+14261956\arctan\left(\frac{1}{299252491}\right)+\frac{404724440}{3}\arctan\left(\frac{2}{826867939}\right)-46329268\arctan\left(\frac{2}{3472598789}\right)+129874672\arctan\left(\frac{1}{3866973557}\right)+\frac{431696812}{3}\arctan\left(\frac{1}{7427844818}\right)-39014080\arctan\left(\frac{1}{12601326140}\right)\frac{-312803384}{3}\arctan\left(\frac{1}{29942196097}\right)\frac{-14995472}{3}\arctan\left(\frac{2}{75525552427}\right)\frac{-531890852}{3}\arctan\left(\frac{1}{64506738863}\right)\frac{-63257576}{3}\arctan\left(\frac{1}{118034929852}\right)\frac{-224661344}{3}\arctan\left(\frac{2}{1087840667761}\right)\frac{-207007156}{3}\arctan\left(\frac{1}{169838669284032}\right)$$