Subject: Combinations of Numbers.
Name: Shea
Who are you: Student
Hello,
Here is the problem:
A "train of length 5" is a row of blocks whose combined
length is 5. Here are some examples: 122, 212, 131, 5, 14.
If you use identical blocks in a different order,
this is a separate train. How many trains of length 5 are there? Come up
with a formula for the number of trains of length n.
I know all the lengths:
N 
Combinations 
1 
1 
2 
2 
3 
4 
4 
8 
5 
16 
6 
32 
I know the relationship is that the number of your combinations
for the next number will be the combination before doubled. My question
is,...how do I write a formula for that?
Shea
