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.
exponential fit (0,1),(1,4),(2,13),(3,40),(4, 121),(5, 364)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random