Incorrect output from ConvolutionIID(X,n) for large values of n #1

When computing the following code, APPLPy produces the correct output to n= 1 ... 11. After n=12, piecewise segments on the right tail of the distribution are incorrectly computed. This may be related to the size and complexity of the integration that SymPy needs to perform for large values of n.

U=UniformRV(0,1)
n_list=range(1,15)
results=[]
for n in n_list:
UConv=ConvolutionIID(X,n)
results.append(UConv)