 | ECS #443 |
| Introduction | Examples | Search | Submit | Help | Links |
1. Description
No description available
2. Specification
This unlabelled structure is specified as S in
\displaystyle
\left\{ B={\rm Union} \left( S,C \right) ,C={\rm Prod} \left( S,E
\right) ,E={\rm Union} \left( B,C \right) ,S={\rm Union} \left( C,Z
\right) \right\}
other formats
3. Coefficients
3.1. First terms
3.2. Recurrence
\displaystyle
\left\{ \left( 4\,n-4 \right) f \left( n \right) + \left( -4-8\,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) =1 \right\}
other formats
3.3. Asymptotics
4. Ordinary generating function
\displaystyle
1/6+1/3\,x-1/6\,\sqrt {1-8\,x+4\,{x}^{2}}
other formats
5. References
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).