21522228domain: NAppears in sequencesNumber of ternary irreducible monic polynomials of degree n; dimensions of free Lie algebras.at n=18A027376Dimensions of primitive Lie algebras connected with the Mantaci-Reutenauer algebra MR^(2).at n=17A185171Number of prime 3-ary toroidal arrays with 2 rows and n columns.at n=8A291076