[en] The inclusive production was studied of charmed baryon Λ_c⁺ in interactions of 40 to 70 GeV/c neutrons with protons of a hydrogen target. The experiment was performed with the use of magnetic spectrometer BIS-2 located in the neutron beam of the Serpukhov accelerator. The signal of Λ_c⁺ was observed in the effective mass spectra of Λ⁰π⁺π⁺π^-. After the removal of interactions occurring on the container of liquid hydrogen, the signal consisted of 14 combinations corresponding to ∼4 standard deviations of background. Its mean value was 2262 MeV/c², the width of the bin containing signal was 20 MeV/c². On the basis of this signal the value was determined of the cross section of Λ_c⁺ production times the branching ratio of its observed decay mode σxBr(Λ_c⁺→Λ⁰π⁺π⁺π^-) = 0.26±0.11 μb in the kinematic region of x_F>0.5 and p_T<1 GeV/c. (author). 10 figs., 15 refs