I am too Lazy to update about me.
Yes a pda can have two accepting/final states. If you look at the Formal definition of a PDA,
A PDA is formally defined as a 7-tuple:
is a finite set of states
F is the set of accepting states, that means it can be any number of accepting states but should be a subset of Q.
Please explain how many binary trees (structurally different) can be formed using n unlabelled nodes by using just the concept of combinations and not directly using the formula of Catalan Numbers.