How to find the number of non-isomorphic binary trees with $n$ nodes?
100832
Number of binary trees with $N$ nodes
108631
Calulating the Ramsey number $R(T, K_{1,n})$ of a tree $T$ and bipartite graph $K_{1,n}$
155372
Find the number of permutations in $S_n$ containing fixed elements in one cycle
37754
Number of vertices of a complete graph with $n$ edges
41448
Counting set for generating functions
138595
How many types of distinct Binary Tree can be formed with a height of h?
98355
Is the set of all possible binary strings countable?
146098
Number of nonempty subsets of a set with $n$ elements
129050
Find the number of non-zero squares in the field $Zp$
93459
Number of permutations of unspecified length
123407
Combinatorics - binary - very interesting question
8458
Combinatorics problem based on Ferrers graph
42706
How many $N$ digits binary numbers can be formed where $0$ is not repeated
155831
What are the total number of ordered permutations of a list of elements (possibly repeated)?
74829
Number of non decreasing sequences of length $M$
7938
Number of Homomorphisms from $\Bbb{Z}_m$ to $\Bbb{Z}_n$
13767
Number of nodes in binary tree given number of leaves