16 isn't a good size according to the Rosenberg paper (http://www.cs.miami.edu/~burt/learning/Csc609.022/random_num...) but 15 and 17 are sizes you could program an ATtiny45 to generate if you just wanted that quality of noise. I'm going to be real interested in trying out the actual noise-generator logic in the follow-up article to see if I can hear any useful tonal difference. Maybe they were just frustrated by hardware that kept drifting into the forbidden state and brute-forced it until it couldn't; I've had that happen with PRNGs I built with series-4000 CMOS logic and xgates. Stay tuned, I guess.
