{C}_{j}=\frac{1}{\left({x}_{j}-{x}_{0} \right)\left({x}_{j}-{x}_{1} \right)...\left({x}_{j}-{x}_{j-1} \right)\left({x}_{j}-{x}_{j+1} \right)...\left({x}_{j}-{x}_{n} \right)}.