 | ECS #103 |
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1. Description
No description available
2. Specification
This labelled structure is specified as S in
\displaystyle
\left\{ B={\rm Prod} \left( Z,{\rm Set} \left( Z \right) \right) ,S={
\rm Prod} \left( B,B \right) \right\}
other formats
3. Coefficients
3.1. First terms
3.2. Recurrence
\displaystyle
\left\{ \left( -2\,n-2 \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
{2}^{n-2}n \left( -1+n \right)
other formats
3.4. Asymptotics
4. Exponential generating function
\displaystyle
{x}^{2} \left( {{\rm e}^{x}} \right) ^{2}
other formats
5. References
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).