Download the Sequence import/export maya MIT script:
In Maya, Windows → Genral Editors → Script Editor → Open Script (open folder icon)
serach “Main Procedure” , copy below of the text “craOBJs;” → paste in MEL column
OR
just directly type craOBJs;
in bottom column MEl → a OBJ box pop up
Select the Mesh and keyframe timeline range → Export OBJ sequence
→ chose the save folder location, name the folder → Export box will show