SOLUTION: What comes next in the series 9, 12, 5, 20, ? and why>

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Question 1105694: What comes next in the series
9, 12, 5, 20, ?
and why>
Answer by math_helper(2461) About Me  (Show Source):
You can put this solution on YOUR website!
The number 1 comes next.
These are the sector numbers around a dart board.

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EDIT 1/2/18: To the student: I did a google search and came up with the name Brian Gamlin as the originator of the "infuriating" sequence. He did not follow a formula, but merely arranged lower scores around higher ones so that lucky shots (which I take to mean: near misses) were not overly rewarded. Here is the link http://www.patrickchaplin.com/Number.htm