User threads in specific forums?

[Defkalion]

I want to be able to count the users' threads in specific forums and add them up.

For example, user A has created 2 threads in "forum 32", and 5 threads in "forum 40".

I want to do two things with this;

1. Find the query to count these threads and sum them up
2. Make the resulting number clickable, that will return a search results with the above threads.

Any ideas on this?