  Radiative emission lines from nitrogen and its ions are often observed in
nebulae spectra, where the N$^{2+}$ abundance can be inferred from lines of the
2p4f configuration. In addition, intensity ratios between lines of the 2p3p --
2p3s and 2p4f -- 2p3d transition arrays can serve as temperature diagnostics.
To aid abundance determinations and plasma diagnostics, wavelengths and
oscillator strengths were calculated with high-precision for electric-dipole
(E1) transitions from levels in the 2p4f configuration of N$^{+}$. Electron
correlation and relativistic effects, including the Breit interaction, were
systematically taken into account within the framework of the
multiconfiguration Dirac-Hartree-Fock (MCDHF) method. Except for the 2p4f -
2p4d transitions with quite large wavelengths and the two-electron-one-photon
2p4f -2s2p$^3$ transitions, the uncertainties of the present calculations were
controlled to within 3% and 5% for wavelengths and oscillator strengths,
respectively. We also compared our results with other theoretical and
experimental values when available. Discrepancies were found between our
calculations and previous calculations due to the neglect of relativistic
effects in the latter.
