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.
u(n+1) = (n+1)*u(n) - 1, u(0) = e-1
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random