Sons of Shantanu and Satyavati.
Chitrangada was killed by Chitrangada. He was unmarried and childless.
Vichitravirya was married with Ambika and Ambalika. He died young and was also childless.
In 16 chapters the Mahabharata is told from Bharata to Pandu. The link is the first chapter. All chapters are found in June 2016.
http://hindumythologyforgennext.blogspot.com/2012/07/mahabharatha-chapter-1-emperor-bharat.html