Package - awtools
Novelty - Yes
Type - sequential

awtools - gpalette

Github

awhstin/awtools

CRAN

Not on CRAN

Use with paletteer package:

library(paletteer)
paletteer_d("awtools::gpalette")

Use raw:

c("#D6D6D6FF", "#ADADADFF", "#707070FF", "#333333FF")