Incidentally, the hue-degree-loop is a great start, but several interesting things about color become immediately apparent. Specifically, that the "density" of color resolution varies dramatically across the hue range. 5 is massively different from 25, which is massively different from 45. But 105 is almost indistinguishable from 125; similar with 225 and 245, and 305 and 325.
So it took a lot of fine-tuning, taking a few colors down in value, and then adding a grayscale series and a few darker colors.
Btw, black and white wouldn't normally be used by the player (black is a zombie color, white is a natural-resources color) but some folks in AIWC really liked using them