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The Houdini Engine for Unreal plugin allows for Animation Sequence assets to be imported into Unreal and exported from Houdini as motion clips. Both support HDAs and NodeSync.
See Motion Clips for more information.
Animation Sequence Input ¶
In Unreal, Animation Sequence assets can be imported to Houdini by selecting them via a Geometry Input.
You can also send it to a live version of Houdini with Session Sync by 
on the animation asset in the Content Browser and selecting Send to Houdini.
In the Houdini Engine session, the Animation Sequence will be converted to a packed Motion Clip.
The clip_info detail attribute will contain some important information, like the animation’s name, frame rate, and range.
Motion Clip Output ¶
In Houdini, if an output contains a packed Motion Clip, the plugin will convert it to an Animation Sequence asset after cooking.
Make sure the Motion Clip is packed. Some nodes such as the Motion Clip Evaluate will unpack the motion clip which the plugin will not detect it. You can re-pack a motion clip using a Motion Clip SOP and turning on the Pack Inputs parameter.
You cannot assign an existing Unreal Skeleton asset to the animation by using the unreal_skeleton attribute.