Factorial Summation Problem
123853
Finding a formula for $1+\sum_{j=1}^n(j!)\cdot j$ using induction
115686
A finite summation of double binomial coefficients
84121
Double factorial series
68481
Finite Summation of Fractional Factorial Series
90032
Problem on Sum of Digits of a Number
149759
Problem on multiplication formulae.
20224
Calculating factorial of large numbers in C
98082
Another combinatorics problem: $\sum\limits_{k = 0}^n (-1)^k \binom{2n-k}k2^{2n-2k}=2n+1$
155150
Division of Factorials [binomal coefficients are integers]
112827
Find the sum of the binomial coefficients
33104
Combinatorial Proof with Summation Identity
25426
A sum of series problem: $\frac{3}{1!+2!+3!} + \frac{4}{2!+3!+4!} + \cdots + \frac{2008}{2006!+2007!+2008!}$
36361
How to calculate the summation $(\sum_{p = k}^{n} \binom{n}{p}) / 2^n$ quickly?
70041
Sum with parameter convergence
140632
A problem on Binomial Theorem
151384
Summation of series involving binomial coefficients and polynomial of degree at most n-1
14884
Compute a sum with partial fraction decomposition and generating functions