Ancestors from Omdalsstrand, Solum, Telemark

Hello, I am fairly new at genealogy and am trying to find pedigree information on my G-G-G-G-Grandparents Niels Arnesen and Anne Carlsdatter. They had a son, Carl Nilsen Bergen (christened 08 Jul 1798 in Solum, Telemark) who married Anna Marie Hansdatter Tveitan on 29 Dec 1817, in Solum, Telemark. I have traced this information through Ancestry.com, FamilySearch.org, and a short family history that my G-Grandfather Carl Hansen Siljan wrote in 1930. He did not have any information further than his paternal grandparents (Carl Nilsen Bergen and Anna Marie Hansdatter Tveitan) and maternal grandparents (Lars Jacobsen Siljan and Aslaug Kirstine Haukelia.) Carl Nilsen Bergen owned two farms---Langland in Helgen and Tveitan in Maelum. Carl Hansen Siljan wrote about a Holla Book (the history of Holla Holden and its development by S. Ytterboe, M.A.) which states that the Siljan family is the most numerous family in the district of Tele (Bratsberg County) and can be traced back to 1662. I am hoping someone can help me find pedigree information on Carl Nilsen Bergen and Niels Arnesen. Thank you.