 | ECS #124 |
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1. Description
No description available
2. Specification
This unlabelled structure is specified as S in
\displaystyle
\left\{ B={\rm Sequence} \left( S \right) ,C={\rm Sequence} \left( Z,1
\leq {\rm card} \right) ,S={\rm Prod} \left( C,B \right) \right\}
other formats
3. Coefficients
3.1. First terms
3.2. Recurrence
\displaystyle
\left\{ 5\,nf \left( n \right) + \left( -4-6\,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 \right\}
other formats
3.3. Asymptotics
4. Ordinary generating function
\displaystyle
1/2\,{\frac {-1+x+\sqrt {1-6\,x+5\,{x}^{2}}}{-1+x}}
other formats
5. References
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).