Total number of permutations of zeros and ones
43033
Proof on Catalan numbers
39724
Combinatorial Identities
133497
Group Membership Test for Permutations
105055
How can I find all of the permutations consisting of 1 element from a variable number of arrays of variable length?
54941
number of trailing zeros
35648
How many permutations of the set n={1,2,3,3,3,4,4,5} are possible without any consecutive identical elements?
46971
Number of surjections from $\{1,...,m\}$ to $\{1,...,n\}$
3217
Construction of uncountably many non-isomorphic linear (total) orderings of natural numbers
122504
Factorisations of permutations
19101
Permutation induced by a partition
134066
Total number of factors of a number
142477
Closed-form expression for the number of $k$-permutations of length $n$. Duplicates allowed!
66784
Number of strings lenght $n$ with no consecutive zeros
128834
Proving the number of even and odd permutations of a subgroup $H<S_{n}$ are equal, provided $H$ is not contained in $A_{n}$
56828
A combinatorial proof that the alternating sum of binomial coefficients is zero
140630
Permutations in JavaScript?
158708
Counting the adjacent swaps required to convert one permutation into another