 | ECS #423 |
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1. Description
No description available
2. Specification
This unlabelled structure is specified as S in
\displaystyle
\left\{ B={\rm Prod} \left( S,S,S \right) ,C={\rm Prod} \left( Z,B
\right) ,S={\rm Union} \left( Z,C,B \right) \right\}
other formats
3. Coefficients
3.1. First terms
3.2. Recurrence
\displaystyle
\left\{ 3\,nf \left( n \right) +2\,nf \left( n+1 \right) + \left( -n-2
\right) f \left( n+2 \right) =0,f \left( 0 \right) =0,f \left( 1
\right) =1 \right\}
other formats
3.3. Asymptotics
4. Ordinary generating function
\displaystyle
x-1/2\,{\frac {2\,{x}^{2}+x-1+\sqrt {-3\,{x}^{2}-2\,x+1}}{x+1}}
other formats
5. References
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).