 | ECS #113 |
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1. Description
No description available
2. Specification
This unlabelled structure is specified as S in
\displaystyle
\left\{ B={\rm Union} \left( C,Z \right) ,C={\rm Sequence} \left( Z,0<
{\rm card} \right) ,S={\rm Set} \left( B \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( -2+{x
}^{j_{{1}}} \right) }{ \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).