 | ECS #74: Balls and Urns |
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1. Description
Ways to place balls into urns: indistinguishable balls and indistinguishable urns
2. Specification
This unlabelled structure is specified as S in
\displaystyle
\left\{ S={\rm Set} \left( U \right) ,U={\rm Sequence} \left( Z,1\leq
{\rm card} \right) \right\}
other formats
3. Coefficients
3.1. First terms
4. Ordinary generating function
\displaystyle
{{\rm e}^{\sum _{j_{{1}}=1}^{\infty }-{\frac {{x}^{j_{{1}}}}{ \left( -1
+{x}^{j_{{1}}} \right) j_{{1}}}}}}
other formats
5. References
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).