A nice 64 color palette?

palette.py

from PIL import Image

img = Image.new(mode="RGB", size=(8,8))
pixels = [ ]

# Black
pixels.append((0,0,0))
# Greys and white
for i in range(15):
    v = int((i + 1) * (255 / 15))
    pixels.append((v,v,v))

# Seven colors, red orange yellow green cyan blue magenta repeated 7 times at different intensities
def mcolor(i):
    if i < 3:
        lut = {0: 0, 128: 128 * ((i + 1) / 4), 255: 255 * ((i + 1) / 4)}
    elif i == 3:
        lut = {0: 0, 128: 128, 255: 255}
    else:
        lut = {0: 272 * ((i - 3) / 4.5), 128: 272 * ((i - 3) / 3.5), 255: 255}

    def result(c):
        l = map(lambda l: int(min(255,lut[l])), list(c))
        return tuple(l)

    return result

for i in range(7):
    for c in map(mcolor(i), [(255,0,0),(255,128,0),(255,255,0),(0,255,0),(0,255,255),(0,0,255),(255,0,255)]):
        pixels.append(c)

final_pixels = list(map(lambda x: x[1], filter(lambda x: x[0] != 59, enumerate(pixels))))
        
print(len(final_pixels))
print(final_pixels)
img.putdata(final_pixels)

img.save('palette.png')