Sexe genealogy

I am the grandson of Mary Rose Sexe (1922-2000) of Louisville, Kentucky. Mary was the daughter of Henry Sexe who was born in Iowa and died in Louisville (1897-1972). Henry was the son of Alfred H Sexe, born in Minnesota (1872) who was the son of Henry O Sexe who may have been born in Norway (1846). My research has found Henry O Sexe residing in Minnesota. The census's I have found seem to clearly identify his birth year as 1846. I have found a reference to a Hans Skjone Asmundsen Sexe (1855-1934) having a son named Henry, but the dates of birth don't seem to work. I know little about Norwegian research, but with some help may be able to link my Sexe line to some of the lines I have seen discussed on this forum. Thanks in advance for anyone willing to help this novice researcher.