I was trying to animate something that was scaling exponentially, so I created an fcurve with two keyframes and configured it for exponential easing. It did not behave as I expected.
Consider two keyframes (frame,value): (1,1) and (11,32).
I would expect that to be interpolated as (3,2) (5,4) (7,8) (9,16) , doubling every two frames.
Instead I see (3,1.121) (5,1.484) (7,2.938) (9,8.75) .
What are the equations governing blender's exponential interpolation mode?