 | ECS #159 |
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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( Z,C \right) ,C={\rm Sequence} \left( S
\right) ,S={\rm Sequence} \left( B,1\leq {\rm card} \right) \right\}
other formats
3. Coefficients
3.1. First terms
3.2. Recurrence
\displaystyle
\left\{ \left( n-1 \right) f \left( n \right) + \left( -3-6\,n
\right) f \left( n+1 \right) + \left( n+2 \right) f \left( n+2
\right) =0,f \left( 0 \right) =0,f \left( 1 \right) =1,f \left( 2
\right) =2 \right\}
other formats
3.3. Asymptotics
4. Ordinary generating function
\displaystyle
1/2-1/2\,x-1/2\,\sqrt {1-6\,x+{x}^{2}}
other formats
5. References
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).