In which season and league did the Hellas Verona Football club compete against 21 other teams?
2017–18 Hellas Verona F.C. season:  Verona earned promotion back to the top-flight after finishing second in the 2016–17 Serie B. 2016–17 Serie B:  A total of 22 teams were contesting the league: 15 returning from the 2015–16 season, 4 promoted from Lega Pro, and 3 relegated from Serie A.
2016–17 Serie B