Are there computer packages which calculate coefficients of generating functions, such as

$$D_n(q)=\sum_m d_{m,n}q^m= \frac{1}{\prod_{i=1}^n (1-q^i)^2} \text{ or}$$

$$S_d(q)=\sum_m s_{m,d}q^m = \frac{q^d}{\prod_{i=1}^d (1-q^i)} \; ?$$

The effort, to calculate all coefficients e.g. $d_{k,l}$ for $k$ and $l$ smaller than $N$ should grow with $N^3$, as they satisfy recursion relations such as

$$d_{m,n} = \sum_{k=0}^{[m/n]}(k+1)d_{m-k\cdot n,n-1}$$

which allow to express each of the $N^2$ coefficients as a sum of at most $N$ terms ($d_{m,1}=m+1$, $d_{0,0}=1$, $d_{m,0}=0$ for $m>0$).

Before I revive my rusty computer knowledge I would like to know whether computer packages such as GAP tackle my problem to solve recursion relations with given initial conditions, save the solutions to files and allow to read them in again if one wants to tackle the next case $N+1$.

`$H$`

. If you want to see H, you'd say $H$. Also, to center the display, it is best to enclose the equation by double dollars. Do not have a number of spaces in the beginning of a line. Any line that begins with four space is treated as code and once again, MathJaX cannot parse it. $\endgroup$ – knsam Jun 27 '13 at 20:19