The sequence of 1,2,6,24120 Urgent request Normal, no n!

f(x)=x!
For example, 1:1
2：1*2=2
3：1*2*3=6
4：1*2*3*4=24
5：1*2*3*4*5=120
.
If you need a general formula, you can write it as
seriesProduct(n,n,1,x)
It means 1 * 2 * 3 * 4 *... * X
The symbol of series product is Π

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