SymPy Gamma

Input:

product(i%2C%20(i%2C%201%2C%20k)%2C%20(k%2C%201%2C%20n))

Error:

product(i%2C%20(i%2C%201%2C%20k)%2C%20(k%2C%201%2C%20n))

specify dummy variables for n*Mod(C*Mod(k*Mod(C*Mod(i, 2), 20)*Mod(C*Mod(Mod(C*Mod(i, 2), 201), 2), 20), 2), 20)*Mod(C*Mod(Mod(C*Mod(k, 2), 201), 2), 20)

See what Wolfram|Alpha has to say.

Need more control? Try SymPy Live.