Pulley system composition – a systematic approach (2020)
https://www.kiipeilytuomas.fi/articles-in-english/pulley-system-composition-a-systematic-approach/loading story #40300417
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I was waiting for the mathematical abstraction or software analogy; obviously, there's some composition going on.
Yes! Which entry in https://oeis.org (The On-Line Encyclopedia of Integer Sequences) is this?