Is this approximation for a factorial a known formula?
105406
Proof of Stirling's Formula using Trapezoid rule and Wallis Product
120913
How would you write a non-recursive algorithm to calculate factorials?
14540
Any shortcut to calculate factorial of a number (Without calculator or n to 1)?
634
Closed form formula for $\sum\limits_{k=1}^n k^k$
36361
How to calculate the summation $(\sum_{p = k}^{n} \binom{n}{p}) / 2^n$ quickly?
43499
Repeatedly taking differences on a polynomial yields the factorial of its degree?
15618
Can Mathematica propose an exact value based on an approximate one?
109131
Find limit with factorial
113628
Where M is a matrix calculate a formula for M^n
42462
Use a linear approximation to estimate the number $64.07^{2/3}$
94207
Is there an inverse to Stirling's approximation?
78314
Generating function for the factorial sequence
75367
Find a simple formula for $\binom{n}{0}\binom{n}{1}+\binom{n}{1}\binom{n}{2}+...+\binom{n}{n-1}\binom{n}{n}$
128971
Explicit formulas for Stirling numbers of second kind
148393
Intuition to the Resolution of a fractional factorial design
93944
How to calculate what this power series converges against? (double factorials)
158682
Evaluation of $\lim_{n\rightarrow \infty}\frac{n!\cdot e^n}{\sqrt{n}n^n}$ without stirling approximation