Talk:List rooted trees

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Revision as of 20:59, 20 August 2015 by rosettacode>Craigd (Question about enumerating ways to nest)
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Definition of ways to nest

If I understand correctly, OEIS A81 lists the number of unique ways n bags can be nested, eg 9 for 5 bags. The task description states "As an example output, run 5 bags. There should be 12 ways.". In addition, "( () (()) () )" is considered different from "( (()) () () )". Please explain.

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