Riordan numbers: Difference between revisions
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Riordan numbers show up in several places in set theory. They are closely related to [[Motzkin numbers]], and may be |
Riordan numbers show up in several places in set theory. They are closely related to [[Motzkin numbers]], and may be used to derived them. |
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Riordan numbers comprise the sequence '''a''' where: |
Riordan numbers comprise the sequence '''a''' where: |
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