 | ECS #410 |
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1. Description
No description available
2. Specification
This labelled structure is specified as S in
\displaystyle
\left\{ B={\rm Set} \left( Z \right) ,S={\rm Prod} \left( Z,Z,B
\right) \right\}
other formats
3. Coefficients
3.1. First terms
3.2. Recurrence
\displaystyle
\left\{ \left( -n-1 \right) f \left( n \right) + \left( -1+n \right)
f \left( n+1 \right) =0,f \left( 0 \right) =0,f \left( 1 \right) =0,f
\left( 2 \right) =2 \right\}
other formats
3.3. Closed form
\displaystyle
n \left( -1+n \right)
other formats
3.4. Asymptotics
4. Exponential generating function
\displaystyle
{x}^{2}{{\rm e}^{x}}
other formats
5. References
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).