Information on mass chains and nuclides available on this website:

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¹⁹C has been observed in the 4.8 GeV proton bombardment of uranium: it is particle stable (BO74A). The calculated mass excess of ¹⁹C is 32.45 MeV using the modified form of the IMME (JE75): ¹⁹C would then be stable with respect to decay into ¹⁸C + n by 0.53 MeV and into ¹⁷C + 2n by 4.72 MeV [see (82AJ01) for the mass of ¹⁷C. See also (78AJ03).