Calculating number of functions from a set of size $m$ to a set of size $n$
102515
Counting functions between two sets
24146
Number of ways to partition a rectangle into n sub-rectangles
60697
Defining functions from expressions of variable lengths
31326
Number of $(0,1)$ $m\times n$ matrices with no empty rows or columns
43849
Calculating number of elements commmuting with $\sigma\in S_{10}$
142477
Closed-form expression for the number of $k$-permutations of length $n$. Duplicates allowed!
153370
Number of different partitions of N
26569
Counting binary operations on a set with $n$ elements
72402
Summation of natural number set with power of $m$
21754
Partition a set into subsets of size $k$
7938
Number of Homomorphisms from $\Bbb{Z}_m$ to $\Bbb{Z}_n$
150210
Finding total number of multi-sets
102672
How to compute the L^2-distance of a given function to the set of Gaussian functions
28453
Finding all partitions of a set
133551
How to create functions of arbitrary number of variables?
17268
Cycles in permutations of a given size
1627
Cartesian product of an arbitrary number of sets