We give recurrence formula for dimensions of Koszul operads. For example, dimensions of multi-linear parts of Lie-admissible operad satisfy the following recurrence relations dn=∑i=1n-1 μk Bn-1,k(d1dn-1), where Bn,k are Bell polynomials and μk = k! ∑i=0k (ki+1)i /i !. If p ≥ 5 is prime, then dp-1 ≡ 1 (mod p), dp ≡ -1 (mod p), dp+1 ≡ -1 (mod p), dp+2 ≡ -6 (mod p), dp+3 ≡ -56 (mod p), dp+4 ≡ -725 (mod p).

This video was produced by the Universidade de São Paulo, as part of the LieJor Online Seminar: Algebras, Representations, and Applications.