4 and 6 additions only

Question

Given a number n, In how many ways , n can be formed by adding 4 and 6 only with atmost m times use of 6 and 4.
For example :
12 in two ways with atmost three times (4 or 6)
{4,4,4}
{6,6}
Second example:
10 in only one way
{4,6}