 | ECS #141 |
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1. Description
No description available
2. Specification
This unlabelled structure is specified as S in
\displaystyle
\left\{ B={\rm Sequence} \left( Z \right) ,C={\rm Sequence} \left( Z,1
\leq {\rm card} \right) ,E={\rm Prod} \left( B,C \right) ,S={\rm Set}
\left( E \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) ^{2}j_{{1}}}}}}
other formats
5. References
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).