Help : IndexError - probably pretty simple

[JT]

I wanted to thank everyone for responding to my post.  With your help
I got the module working.  I ended up changing the list declaration
from "ov = []" to "ov = [None] * (n+1)"  This fixed the indexing error
and allowed the module to work.  I then had to make many changes to
get the binomial tree working properly in the for loops.  But I did
get it working and I wanted to thank you for your help.

JT