Write a python function to find sum of even index binomial coefficients.
import math  
def even_binomial_Coeff_Sum( n): 
    return (1 << (n - 1)) 
<s>[INST]<<SYS>>Given a task and its code, generate test cases for the code.<</SYS>>Write a python function to find sum of even index binomial coefficients.
import math  
def even_binomial_Coeff_Sum( n): 
    return (1 << (n - 1)) [/INST]assert even_binomial_Coeff_Sum(4) == 8
assert even_binomial_Coeff_Sum(6) == 32
assert even_binomial_Coeff_Sum(2) == 2</s>