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.
Table[2^(n(n-1)/2)-2 n 2^((n-2)(n-1)/2)+n(n-1)2^((n-3)(n-2)/2),{n, 3, 6}]
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random