Comment #14 on issue 2476 by sapta.ii...@gmail.com: nth order Derivative http://code.google.com/p/sympy/issues/detail?id=2476
I'll write up something a bit more elaborate later but for now, if you want stuff to be symbolic you just need to provide a mapping from the set of [1..n] to whatever symbols you want. This was discussed earlier and it was decided that having symbols would make things complicated as you would need to provide an order over all the symbols for this to work. Anyway, a cursory look at the formula provided shows that the partition set being considered is {1..n}. This is already done and will be up for a pull request by tomorrow (needs tests and a few more cute functions.)
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