  Motives of Brauer-Severi schemes of Cayley-smooth algebras associated to
homogeneous superpotentials are used to compute inductively the motivic
Donaldson-Thomas invariants of the corresponding Jacobian algebras. This
approach can be used to test the conjectural exponential expressions for these
invariants, proposed in arXiv:1510.08116. As an example we confirm the second
term of the conjectured expression for the motivic series of the homogenised
Weyl algebra.
