Reference for Menachot 57:1

ותמני סרי דקנים הא עשרין ותרתין כפתורין נמי אחד עשר כפתורין תרי דידה וששה דקנים וכפתר וכפתר וכפתר הא חד סר

and the eighteen of the [six] branches make twenty-two. It is also clear that there were eleven knops, for the knops thereof implies two, and six of the [six] branches and the knop [from which the first pair of branches rose], and the knop [from which the second pair rose], and the knop [from which the third pair rose], thus making a total of eleven.

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