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(-1)^k(ln2)^(k-1)k^(k-1)/(2^(k-1)k!),k=1 to inf
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random