Ordered Bell Number Calculator

Σ C(n,k) · OB(n-k)

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About Ordered Bell Number Calculator

An ordered Bell number calculator computing OB(n) = Σ C(n,k)·OB(n-k). Equivalent to Fubini numbers but emphasizes the composition structure: choose a non-empty subset as the 'first tier', recurse on the rest. OB(3)=13. Client-side.

Ordered Bell Number Calculator Features

  • OB(n) value
  • Recurrence
  • Tier breakdown
  • Sequence
  • Composition link

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