Package - ggprism
Novelty - Yes
Type - qualitative

ggprism - shades_of_gray

Github

csdaw/ggprism

CRAN

ggprism

Use with paletteer package:

library(paletteer)
paletteer_d("ggprism::shades_of_gray")

Use raw:

c("#000000FF", "#A0A0A4FF", "#808080FF", "#A0A0A4FF", "#606060FF", "#A0A0A4FF", "#606060FF", "#A0A0A4FF", "#A0A0A4FF")