sqrt(12) * (1 - (1/(3*3)) + (1/(5*(3^2))) - (1/(7*(3^3))) + (1/(9*(3^4))) - (1/(11*(3^5))) + (1/(13*(3^6))) - (1/(15*(3^7))) + (1/(17*(3^8))) - (1/(19*(3^9))) + (1/(21*(3^10))) - (1/(23*(3^11))) + (1/(25*(3^12))) - (1/(27*(3^13))) + (1/(29*(3^14))) - (1/(31*(3^15))) + (1/(33*(3^16))))