 | ECS #73: Balls and Urns |
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1. Description
Ways to place balls into urns: distinguishable balls and indistinguishable urns
2. Specification
This labelled structure is specified as S in
\displaystyle
\left\{ S={\rm Set} \left( U \right) ,U={\rm Set} \left( Z,1\leq {\rm
card} \right) \right\}
other formats
3. Coefficients
3.1. First terms
4. Exponential generating function
\displaystyle
{{\rm e}^{{{\rm e}^{x}}-1}}
other formats
5. References
- Bell numbers
- EIS A000110
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).