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%5B(2n)/3%5E(n%20%2B%201),%20%7Bn,%201,%20Infinity%7D%5D
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
