 | ECS #45: Unlabelled Non Plane Binary Trees |
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1. Description
Unlabelled Non Plane Binary Trees
2. Specification
This unlabelled structure is specified as S in
\displaystyle
\left\{ S={\rm Union} \left( Z,{\rm Prod} \left( Z,{\rm Set} \left( S,
{\rm card}=2 \right) \right) \right) \right\}
other formats
3. Coefficients
3.1. First terms
4. Ordinary generating function
\displaystyle
[S \left( x \right) =x+x \left( 1/2\,S \left( {x}^{2} \right) +1/2\,
\left( S \left( x \right) \right) ^{2} \right) ,Z \left( x \right) =x
]
other formats
5. References
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).