Would James Bond movies "count". We need to define what is a sequel as opposed to the same character in a series of movies.
Star Wars is a Sequel - same band of characters fighting the evil empire.
Spiderman is a sequel - Spiderman fighting bad guyes and has continuing story of him and Mary Jane. Not to mention his friend who keeps fighting him in all 3 movies because he believes Spiderman killed his father.
James Bond has a lot of SEPARATE adventures where the only character that continues is himself. The plot of the next one has no relationship to the previous one.
You can see any James Bond movie as an entity of itself. Star Wars, Spiderman, even Indiana Jones, there are references to what came before and it is advisable that you see the previous one to have deeper understanding of the sequel.