How to create series with alternate step size?

I am trying to create a list with which to cut a tree. However I wish the step size to alternate between steps. For example a pattern like -1,-2,-2.

Thank you very much for the help.

Desired Result

Desired Formula

My unsatisfactory attempt

My unsatisfactory result

Hello
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Alternate Step Selection_re.gh (11.2 KB)

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Amazing! Thank you!

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