Package - unikn
Novelty - Yes
Type - sequential

unikn - pal_grau

Github

hneth/unikn

CRAN

unikn

Use with paletteer package:

library(paletteer)
paletteer_d("unikn::pal_grau")

Use raw:

c("#E1E2E5FF", "#B8BCC1FF", "#9AA0A7FF", "#73787EFF", "#4D5054FF")