Counting number of rearrangements in which no person has the same right neighbor
6204
How many permutations of $\{1, \ldots, n\}$ exist such that none of them contain $(i, i+1)$ (as a sequence) for $i \in {1,...,(n-1)}$?
68882
Path to Combinatorics Problem [$1.11$]
77500
How to remove repeated permutations?
136449
Combinatorics problem on $20$ people, $12$ months, and distinguishable groups
79881
The Matching Problem/Derangements - n letters to n people
155372
Find the number of permutations in $S_n$ containing fixed elements in one cycle
19101
Permutation induced by a partition
74829
Number of non decreasing sequences of length $M$
27273
Count the number of topological sorts for poset (A|)?
109826
Probability of list having a pair of unchanged consecutive elements once ordered
17580
Combinatorics That Looks Similar to Vandermonde's Identity
12835
How to efficiently find positions of duplicates?
17268
Cycles in permutations of a given size
23322
Combinatorics Inclusion - Exclusion Principle
39540
Efficient Algorithm for finding left (or right) Transversal in a Group
96585
Sums and permutation
35515
Find the number of $(m+n)$ digit binary sequences with $m$ $0$'s and $n$ $1$'s such that no two $1$'s are adjacent