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.
(1+x^3+x^6+x^9+x^12)(1+x+x^2)(sum x^i, i=0..13)^2
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random