Brian Parsons I second the Mountain Ash ID. Best guess is that this is a Sorbus acuparia seedling planted by a bird. Can't really tell unless you examine hairs on the underside of leaflets.
ScottRasmussen This looks like it's probably a species of Mountain Ash, genus Sorbus, instead of a fern. http://plants.usda.gov/java/profile?symbol=SORBU
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