This is a general question which I'm not really quite sure is appropriate here so before you decide to down vote, just drop me a message that it's not appropriate and it will be promptly removed or relocated.
Now on the question:
Are there any programs that can crack most number sequences for the purposes of finding the answer? I often purchase second hand puzzle books, and they often don't have answers in them or the rule for any given nth term. The problem is when I encounter a sequence I can't solve, I don't have a solution to work off or a AP/GP rule to work off of. So the focus of the question is are there any programs that can be given an input and give possible answers and possibly a rule, although the rule is unnecessary, as I can work that out myself.
Many thanks in advance.