Choosing a Composition of n and then choosing a Composition of each of its components
9971
enumerative combinatorics,In how many ways (as a function of n) can one choose a composition α α of n
106397
Counting ways to partition a set into fixed number of subsets
133436
Inclusion-Exclusion: INTELLIGENT permutations
120748
Combination With Finite Replacements
74730
Combinatorial Proof of ${{n}\choose{k}} {{k}\choose{j}} = {{n}\choose{j}} {{n-j}\choose{k-j}}$
96086
Double Factorial: Number of possibilities to partition a set of $2n$ items into $n$ pairs
100061
The Maximum possible order for an element $S_n$
146098
Number of nonempty subsets of a set with $n$ elements
153072
Guessing a subset of $\{1,...,N\}$
127596
Composition of equivalence relations
134440
An unexpected application of non-trivial combinatorics
157728
When can you interchange composition of a limit?
57822
Number of ways to choose two disjoint subsets of a set
35156
Constructing a choice function in a complete & separable metric space
12803
Proof for number of weak compositions
73323
Permutations when some objects are alike
55840
Number of functions from n-element set to {1, 2, …, m}