my final statement 3

I have been using only my smartphone calculator for checking.  I did not try Wolfram alpha as I am unable to align with mathematical thoughts of Taylor series; when it comes to factorial of mine which I believe is of constant Pi.

I feel one can use consecutive numbers, halving and logarithms to base 10. In this factorial of mine.

I suggest macro adjustment and micro adjustment thereafter.

Macro adjustment for factorial of positive integers. 

Macro adjustment for factorial of numbers from 1 to 0. 

Micro adjustment. 

What about you guys? Did you try my crude 2n factorial formula? What are your ideas?

Do comments below. 

Have a nice day and happy Eid.