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.
f(1)=1, f(2)=2, f(n+2)=(f(n+1)+f(n))/2
f(1)=1, f(2)=2, f(n+2)=(f(n+1)+f(n))/2
Natural Language
Math Input
Extended Keyboard
