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Combined experimental and DFT theoretical results on low-dimensional new Ni+/Ni2+ (d9/d8) homologous series, Lnn+1NinO2n+2 with n =2 and 3 layered oxides with Ruddlesden-Popper (RP)-related structures and isostructural and isoelectronic with the high temperature superconducting cuprates are presented.Temperature variation of magnetization, transport, specific heat and 139La NMR data in La4Ni3O8 evidence the presence of a transition near ~105 K.DFT calculations suggest similarity of the band structure with that of the cuprate superconductors and relate the transition at 105 K to a spin density wave nesting instability of the Fermi surface.