Seeking info Ole Knudsen leaving Buskerud @1861

I have a lot of the Archive records for the family, but can't seem to find records for them leaving Norway or arriving in America. any help would be appreciated. Ole Knudsen Birth Record #31 (Oct 2, 1831) Marriage Record #5 (June 8, 1856) Wife Ingeborg Andersdtr Birth Record #41 (July 7, 1832) Two children born in Norway: Ingebor Birth Record #43 (Oct 18, 1856) Helge Biirth Record #39 (Aug 8, 1859) My great grandmother was born in Dane county Wisconsin on July 5, 1862. She was raised in Sauk County Wisconsin. The 1900 census indicated Ole & Ingeborg immigated in 1861