You may be aware that I made a formula for (2n)!. It was (2n) factorial was approximately equal to (((n+1)(n+2))/2)^n. Here is the link
It was a crude formula and the result was not accurate.
So I posted a query in Wolfram Alpha to plot (((n+1)(n+2))/2)^n divided by (2n)!. The resultant graph seems like a half binomial distribution graph. Half bell graph.
As the graph is known to us the formula (((n+1)(n+2))/2)^2 can be made more accurate.
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