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Yes! fun = NDSolve[{u ρ'[u] + ρ[u - 1] == 0, ρ[u /; u < 1] == 1}, ρ, {u, 0, 20}, WorkingPrecision -> 40, PrecisionGoal -> ∞, AccuracyGoal -> 40, Method -> "StiffnessSwitching"][[1, 1, 2]]; fun[15] (* 7.5899080042980595046528227779709126741*10^-20 *) DickmanRho[15] (* 7.5899080042980595047*10^-20 *) It works not only in V10 (in ...



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