The constructible derived category of P^n is equivalent to the bounded derived category of the principal block of the parabolic category O for sl(n), and to the bounded derived category of a certain special biserial algebra. In the latter two languages, the Serre functor can be explicitly described: as a concatenation of shuffling functors from the perspective of the category O by results of Mazorchuk-Stroppel, and as the Nakayama functor from the perspective of finite-dimensional algebras by results of Happel. In this talk, I will explain a description of the Serre functor from the perspective of perverse sheaves. This is joint work with Lukas Bonfert.