Following our recent discovery of the hexagonal homologous series Lan(n+1)+xNin(n+5)+ySi(n+1)(n+2)-z, which is a peculiar symmetric compositional mirror of the known La(n+1)(n+2)Nin(n-1)+2Sin(n+1), we decided to have a closer look on some neighboring systems with the heavier lanthanides. First of all, it is interesting to note that if representatives of the Ln-richer group have been known within silicides, Ni-richer ones belonged only to lighter pnictides. Our recent discovery suggested there could be another hidden cluster of such compounds.