Alright guys so I caved in and slowed it down. Upon inspection of the newly slowed down riff, I've found the correct sequence of numbers.
3 1 5 9 2 2 1 3 1 1 5 9 2 1 2 3 1 5 9 2 2 1 3 1 5 9 2 1 2 3 1 5 9 2 2 1 3 1 1 5 9 2 1 2
Among those numbers I very quickly spotted the pattern.
3 1 5 9 2 2 1
3 1 1 5 9 2 1 2
3 1 5 9 2 2 1
3 1 1 5 9 2 1 2
3 1 5 9 2 2 1
3 1 1 5 9 2 1 2
This pattern, while quite easy to pinpoint, is ridiculously complex to play, especially in the way they've arranged it. Thanks for your suggestions guys, it turned out to be my own mistake in the transcribing at full speed.