3n - 6
basically, right?
So
(3 * 2) - 6 = 0
(3 * 3) - 6 = 3
(3 * 4) - 6 = 6
(3 * 5) - 6 = 9
(3 * 6) - 6 = 12
And much more fits.
There you go, I hope I helped and didn't confuse you
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