Which plant is this?
Your plant could be a seedling of a large number of plants with compound leaf form. It is hard to say definitively what it is without seeing a flower, seed head or more mature form to give us more to work with. It is very similar to a black elder (Robinia pseudoacacia) but which is hardy in our area but could just as easily be a tropical house plant. We hope you will let us know as any further characteristics develop that may help with an id.