Am I missing something with the math on Will ceding?

I'm sorry if this it nit picky, or if it's been answered a several times before.
If 8 Octavus cede to a Septimus, and 7 Septimus cede to a Sextus. Wouldn't that mean the Sextus recieves from 63 people 7 Septimi and each of their 8 Octavi (7 + 7 x 8) .
The book and the wiki says recieves from 56. The 56 number could be true if you only ever cede the wills from the Octavi moving up the ladder, but then the strength of chart would be wrong, as that only works if it includes half the Septimi's wills as well.

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