factorial

simple: compute the next factorial after the last one in this thread
i start at 1!=1, the person below me computes 2!, the next one after that does 3! and so on

2!=1+2=3

factorials, not triangular numbers

2! 1*2=2

oh ye sorry.
3! 123=6

4!=1×2×3×4=24

5! = 1x2x3x4x5 = 120

6!=1x2x3x4x5x6=720
Didn't say you had to write out the equation but ok

7! = 5040

8! = 40,320

9!=362,880

10! = 3,628,800

11! = 39,916,800 = 3.99168e7

12! = 479,001,600 = 4.79e8

13! = 6,227,020,800 = 6.22e9

14! = 87,178,291,200 = 8.7178e10

15!=1.3076744e+12

2.092278988800*10^13, or 2.092278988800e13

17! = 355,687,428,096,000 or 3.5568e14

the factorial of eighteen is equivalent to one by two by three by four by five by six by seven by eight by nine by ten by eleven by twelve by thirteen by fourteen by fifteen by sixteen by seventeen by eighteen. it's also equivalent to the number: six point four zero two three seven three seven e plus fifteen (or just 6.4023737e+15)

19! = 121,645,100,408,832,000