Hue palette (discrete).
hue_pal(h = c(0, 360) + 15, c = 100, l = 65, h.start = 0, direction = 1)
range of hues to use, in [0, 360]
chroma (intensity of colour), maximum value varies depending on combination of hue and luminance.
luminance (lightness), in [0, 100]
hue to start at
direction to travel around the colour wheel, 1 = clockwise, -1 = counter-clockwise