Note the alternate arrangement of buds/leaves along the stem - cannot be an Aesculus sp.
Moon was on the right track. This is a nut tree, and in fact it's a Carya sp. - likely Carya ovata (Shagbark Hickory) or Carya laciniosa (Shellbark Hickory).
Knowing where the plant is growing might help in the absolute ID. The OP should share that.
