 | ECS #39: Trees |
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1. Description
- Maps of f^2=f
- Trees of height at most 1
2. Specification
This labelled structure is specified as S in
\displaystyle
\left\{ S={\rm Set} \left( {\rm Tree} \right) ,{\rm Tree}={\rm Prod}
\left( Z,{\rm Set} \left( Z,0<{\rm card} \right) \right) \right\}
other formats
3. Coefficients
3.1. First terms
4. Exponential generating function
\displaystyle
{{\rm e}^{x{{\rm e}^{x}}-x}}
other formats
5. References
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).