for rendering animation on octane
after done keyframes, open exporter

choose a path to where you will save project file and its name
and choose a path for where frames will save as pictures
then click to render
octane will be opened, and your scene
check your materials if you want to control or change something with seeing by yourself
and check your lighting etc.
if you are done, then close octane and SAVE your octane file
now you can click to Render Animation button
octane will be opened on each frame and will save as pictures after done rendering
so, that's all
I just hope that developers will add time line support and we won't need to wait octane to reopen and load all scene on each frame

(btw, I'm using C4D too)