Hochschild cohomology for algebras of dihedral type, VII. The family $D(3\mathcal R)$

We compute the Hochschild cohomology groups for algebras of dihedral type which are contained in the family $D(3\mathcal R)$ (from the famous K. Erdmann's classification). In the calculation, we use the beforehand construction of the minimal bimodule resolution for algebras from the family under discussion.