simple continuous acceleration

Dear folks,
I have done some clips with tempo changes but somehow still could not figure out how to do a simple continuous acceleration - without the s-shaped curve function of the curve editor.
This is what I am aiming at:
Is this possible at all?
Thanks for your help!
I have done some clips with tempo changes but somehow still could not figure out how to do a simple continuous acceleration - without the s-shaped curve function of the curve editor.
This is what I am aiming at:
Is this possible at all?
Thanks for your help!