Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
sum(i=2 to 19)(product(j=1 to i-2)(18-j)/18) * ((i-1)/18) * i
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random