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.
A(n+1)=2(A(n)+A(n-1)), A(1)=3, A(2)=6
A(n+1)=2(A(n)+A(n-1)), A(1)=3, A(2)=6
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
